Condensed cyclic compound and organic light-emitting device including the same

ABSTRACT

An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; an organic layer between the first electrode and the second electrode, the organic layer including an emission layer; and at least one condensed cyclic compound represented by Formula 1: 
                         
wherein, in Formula 1, at least one selected from R 1  to R 15  is a group represented by Formula 2:

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application No.10-2019-0041497, filed on Apr. 9, 2019, in the Korean IntellectualProperty Office, the entire content of which is incorporated herein byreference.

BACKGROUND 1. Field

One or more aspects of embodiments of the present relate to a condensedcyclic compound and an organic light-emitting device including the same.

2. Description of the Related Art

Organic light-emitting devices are self-emission devices that canproduce full-color images, and also have wide viewing angles, highcontrast ratios, short response times, and excellent characteristics interms of brightness, driving voltage, and/or response speed, compared todevices in the art.

In an example, an organic light-emitting device may include a firstelectrode disposed (e.g., positioned) on a substrate, and a holetransport region, an emission layer, an electron transport region, and asecond electrode, which are sequentially disposed on the firstelectrode. Holes provided from the first electrode may move toward theemission layer through the hole transport region, and electrons providedfrom the second electrode may move toward the emission layer through theelectron transport region. Carriers, such as holes and electrons, maythen recombine in the emission layer to produce excitons. These excitonstransition from an excited state to a ground state, thereby generatinglight.

SUMMARY

Aspects of embodiments of the present disclosure are directed toward 1)a condensed cyclic compound and 2) an organic light-emitting deviceincluding the same.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

An embodiment of the present disclosure provides a condensed cycliccompound represented by Formula 1:

In Formula 1,

-   -   Y₁ may be N or C(R₁), Y₂ may be N or C(R₂), Y₃ may be N or        C(R₃), Y₄ may be N or C(R₄), Y₅ may be N or C(R₅), Y₆ may be N        or C(R₆), Y₇ may be N or C(R₇), Y₈ may be N or C(R₈), Y₉ may be        N or C(R₉), Y₁₀ may be N or C(R₁₀), Y₁₁ may be N or C(R₁₁), Y₁₂        may be N or C(R₁₂), Y₁₃ may be N or C(R₁₃), Y₁₄ may be N or        C(R₁₄), and Y₁₅ may be N or C(R₁₅), wherein at least one        selected from Y₁ to Y₁₅ is not N,    -   X₁ may be selected from O, S, N(R₁₆), C(R₁₆)(R₁₇), and        Si(R₁₆)(R₁₇),    -   X₂ may be selected from O, S, N(R₁₈), C(R₁₈)(R₁₉), and        Si(R₁₈)(R₁₉), and    -   at least one selected from R₁ to R₁₅ may be a group represented        by Formula 2:

In Formulae 1 and 2,

-   -   L₁ to L₃ may each independently be selected from a single bond,        a substituted or unsubstituted C₅-C₆₀ carbocyclic group, and a        substituted or unsubstituted C₁-C₆₀ heterocyclic group,    -   a1 to a3 may each independently be an integer from 1 to 3,    -   X₃ may be selected from O, S, N(R₂₂), C(R₂₂)(R₂₃), and        Si(R₂₂)(R₂₃),    -   A₁ may be selected from a C₅-C₃₀ carbocyclic group and a C₂-C₃₀        heterocyclic group,    -   Ar₁ to Ar₃ may each independently be selected from a substituted        or unsubstituted C₁-C₆₀ alkyl group, a substituted or        unsubstituted C₂-C₆₀ alkenyl group, a substituted or        unsubstituted C₂-C₆₀ alkynyl group, a substituted or        unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, and a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,    -   R₁ to R₂₃ may each independently be selected from hydrogen,        deuterium, —F —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a carboxylic acid group or a salt thereof, a sulfonic        acid group or a salt thereof, a phosphoric acid group or a salt        thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a        substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted        or unsubstituted C₂-C₆₀ alkynyl group, a substituted or        unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,        —Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁),        —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂),    -   R₁₆ and R₁₇, R₁₈ and R₁₉, and/or R₂₂ and R₂₃ may optionally be        linked to form a saturated ring or an unsaturated ring,    -   b20 may be an integer from 1 to 3,    -   b21 may be an integer from 1 to 6,    -   at least one substituent of the substituted C₅-C₆₀ carbocyclic        group, the substituted C₁-C₆₀ heterocyclic group, the        substituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl        group, the substituted C₂-C₆₀ alkynyl group, the substituted        C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkyl group,        the substituted C₁-C₁₀ heterocycloalkyl group, the substituted        C₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀        heterocycloalkenyl group, the substituted C₆-C₆₀ aryl group, the        substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀        arylthio group, the substituted C₁-C₆₀ heteroaryl group, the        substituted monovalent non-aromatic condensed polycyclic group,        and the substituted monovalent non-aromatic condensed        heteropolycyclic group may be selected from:    -   deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀        alkynyl group, and a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, and a C₁-C₆₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy        group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),        —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂);    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with at least        one selected from deuterium, —F, —C, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl        group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀        cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀        cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀        aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a        C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed        polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂),        —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂);        and    -   —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and    -   Q₁ to Q₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each        independently be selected from hydrogen, deuterium, —F, —C, —Br,        —I, a hydroxyl group, a cyano group, a nitro group, an amidino        group, a hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl        group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀        alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀        heteroaryl group, a monovalent non-aromatic condensed polycyclic        group, a monovalent non-aromatic condensed heteropolycyclic        group, a biphenyl group, and a terphenyl group.

Another embodiment of the present disclosure provides an organiclight-emitting device including: a first electrode; a second electrodefacing the first electrode; an organic layer between the first electrodeand the second electrode, the organic layer including an emission layer;and at least one condensed cyclic compound represented by Formula 1.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an organic light-emitting device accordingto an embodiment;

FIG. 2 is a schematic view of an organic light-emitting device accordingto another embodiment;

FIG. 3 is a schematic view of an organic light-emitting device accordingto another embodiment; and

FIG. 4 is a schematic view of an organic light-emitting device accordingto another embodiment.

DETAILED DESCRIPTION

Reference will now be made in more detail to embodiments, examples ofwhich are illustrated in the accompanying drawings, wherein likereference numerals refer to like elements throughout. In this regard,the present embodiments may have different forms and should not beconstrued as being limited to the descriptions set forth herein.Accordingly, the embodiments are merely described below, by referring tothe figures, to explain aspects of the present description. As usedherein, the term “and/or” includes any and all combinations of one ormore of the associated listed items. Expressions such as “at least oneof,” “one of,” and “selected from,” when preceding a list of elements,modify the entire list of elements and do not modify the individualelements of the list. Further, the use of “may” when describingembodiments of the present invention may refer to “one or moreembodiments of the present invention.”

A condensed cyclic compound according to one or more embodiments isrepresented by Formula 1:

In Formula 1, Y₁ may be N or C(R₁), Y₂ may be N or C(R₂), Y₃ may be N orC(R₃), Y₄ may be N or C(R₄), Y₅ may be N or C(R₅), Y₆ may be N or C(R₆),Y₇ may be N or C(R₇), Y₈ may be N or C(R₈), Y₉ may be N or C(R₉), Y₁₀may be N or C(R₁), Y₁₁ may be N or C(R₁₁), Y₁₂ may be N or C(R₁₂), Y₁₃may be N or C(R₁₃), Y₁₄ may be N or C(R₁₄), and Y₁₅ may be N or C(R₁₅).At least one selected from Y₁ to Y₁₅ is not N.

In Formula 1, at least one selected from R₁ to R₁₅ may be a grouprepresented by Formula 2:

In one or more embodiments, Y₁ may be C(R₁), Y₂ may be C(R₂), Y₃ may beC(R₃), Y₄ may be C(R₄), Y₅ may be C(R₅), Y₆ may be C(R₆), Y₇ may beC(R), Y₈ may be C(R₈), Y₉ may be C(R₉), Y₁₀ may be C(R₁₀), Y₁₁ may beC(R₁₁), Y₁₂ may be C(R₁₂), Y₁₃ may be C(R₁₃), Y₁₄ may be C(R₁₄), and Y₁₅may be C(R₁₅).

In one or more embodiments, Y₁ may be C(R₁), Y₂ may be C(R₂), Y₃ may beC(R₃), Y₄ may be C(R₄), Y₅ may be C(R₅), Y₆ may be C(R₆), Y₇ may beC(R), Y₈ may be C(R₈), Y₉ may be C(R₉), Y₁₀ may be C(R₁₀), Y₁₁ may beC(R₁₁), Y₁₂ may be C(R₁₂), Y₁₃ may be C(R₁₃), Y₁₄ may be C(R₁₄), and Y₁₅may be C(R₁₅), and

In one or more embodiments, R₁ and R₃ to R₁₅ may be each independentlyhydrogen at the same time, and R₂ may be a group represented by Formula2:

In Formula 1, X₁ may be selected from O, S, N(R₁₆), C(R₁₆)(R₁₇), andSi(R₁₆)(R₁₇), and

-   -   X₂ may be selected from O, S, N(R₁₈), C(R₁₈)(R₁₉), and        Si(R₁₈)(R₁₉).

In one or more embodiments, the condensed cyclic compound may berepresented by one selected from Formulae 1-1 to 1-21:

In Formulae 1-1 to 1-21,

-   -   at least one selected from R₁ to R₁₅ may be a group represented        by Formula 2, and    -   R₁ to R₁₉ may each independently be the same as described        herein.

In one or more embodiments, in Formulae 1-1 to 1-21, R₁ and R₃ to R₁₅may be each independently hydrogen at the same time, and R₂ may be agroup represented by Formula 2:

In Formula 2, L₁ to L₃ may each independently be selected from a singlebond, a substituted or unsubstituted C₅-C₆₀ carbocyclic group and asubstituted or unsubstituted C₁-C₆₀ heterocyclic group.

In one or more embodiments, L₁ to L₃ may each independently be selectedfrom:

-   -   a single bond, a cyclobutylene group, a cyclopentylene group, a        cyclohexylene group, a phenylene group, a pentalenylene group,        an indenylene group, a naphthylene group, an azulenylene group,        a heptalenylene group, an indacenylene group, an acenaphthylene        group, a fluorenylene group, a spiro-bifluorenylene group, a        benzofluorenylene group, a dibenzofluorenylene group, a        phenalenylene group, a phenanthrenylene group, an anthracenylene        group, a fluoranthenylene group, a triphenylenylene group, a        pyrenylene group, a chrysenylene group, a naphthacenylene group,        a picenylene group, a perylenylene group, a pyridinylene group,        a pyrazinylene group, a pyrimidinylene group, a quinolinylene        group, an isoquinolinylene group, a benzoquinolinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a thiophenylene group, a furanylene        group, a carbazolylene group, an indolylene group, an        isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, and a dibenzosilolylene group; and    -   a cyclobutylene group, a cyclopentylene group, a cyclohexylene        group, a phenylene group, a pentalenylene group, an indenylene        group, a naphthylene group, an azulenylene group, a        heptalenylene group, an indacenylene group, an acenaphthylene        group, a fluorenylene group, a spiro-bifluorenylene group, a        benzofluorenylene group, a dibenzofluorenylene group, a        phenalenylene group, a phenanthrenylene group, an anthracenylene        group, a fluoranthenylene group, a triphenylenylene group, a        pyrenylene group, a chrysenylene group, a naphthacenylene group,        a picenylene group, a perylenylene group, a pyridinylene group,        a pyrazinylene group, a pyrimidinylene group, a quinolinylene        group, an isoquinolinylene group, a benzoquinolinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a thiophenylene group, a furanylene        group, a carbazolylene group, an indolylene group, an        isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, and a dibenzosilolylene group, each        substituted with at least one selected from deuterium, —F, —Cl,        —Br, —I, a hydroxyl group, a cyano group, a nitro group, an        amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀        alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a        cyclohexenyl group, a phenyl group, a biphenyl group, a        terphenyl group, a pentalenyl group, an indenyl group, a        naphthyl group, an azulenyl group, a heptalenyl group, an        indacenyl group, an acenaphthyl group, a fluorenyl group, a        spiro-bifluorenyl group, a benzofluorenyl group, a        dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        naphthacenyl group, a picenyl group, a perylenyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        quinolinyl group, an isoquinolinyl group, a benzoquinolinyl        group, a naphthyridinyl group, a quinoxalinyl group, a        quinazolinyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group,        —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), and —B(Q₃₁)(Q₃₂).

In Formula 2, a1 to a3 may each independently be an integer from 1 to 3.

-   -   a1 indicates the number of L₁(s), and when a1 is 2 or 3, 2 or 3        L₁(s) may be identical to or different from each other. a2        indicates the number of L₂(s), and when a2 is 2 or 3, 2 or 3        L₂(s) may be identical to or different from each other. a3        indicates the number of L₃(s), and when a3 is 2 or 3, 2 or 3        L₃(s) may be identical to or different from each other.

In one or more embodiments, L₁ to L₃ may each independently be a singlebond at the same time, and a1 to a3 may each independently be 1 at thesame time.

In Formula 2, X₃ may be selected from O, S, N(R₂₂), C(R₂₂)(R₂₃), andSi(R₂₂)(R₂₃).

In Formula 2, A₁ may be selected from a C₅-C₃₀ carbocyclic group and aC₂-C₃₀ heterocyclic group.

In one or more embodiments, A₁ may be selected from a benzene ring, anindene ring, a naphthalene ring, an anthracene ring, a fluorene ring, aphenanthrene ring, a triphenylene ring, a pyrene ring, a chrysene ring,a naphthacene ring, a pyrrole ring, an imidazole ring, a pyrazole ring,a pyridine ring, a pyrimidine ring, a pyrazine ring, a pyridazine ring,an indole ring, an isoindole ring, an indazole ring, a quinoline ring,an isoquinoline ring, a benzoquinoline ring, a naphthyridine ring, aquinoxaline ring, a quinazoline ring, a cinnoline ring, a carbazolering, a phenanthridine ring, an acridine ring, a phenanthroline ring, aphenazine ring, a benzimidazole ring, a furan ring, a benzofuran ring, athiophene ring, a benzothiophene ring, a thiazole ring, an isothiazolering, a benzothiazole ring, an isoxazole ring, an oxazole ring, atriazole ring, an oxadiazole ring, a triazine ring, a benzoxazole ring,a dibenzofuran ring, a dibenzothiophene ring, a benzocarbazole ring, anda dibenzocarbazole ring.

For example, A₁ may be selected from a benzene ring, a naphthalene ring,a pyridine ring, a pyrimidine ring, and a pyrazine ring, but embodimentsof the present disclosure are not limited thereto.

For example, A₁ may be a benzene ring, but embodiments of the presentdisclosure are not limited thereto.

In Formulae 1 and 2, Ar₁ to Ar₃ may each independently be selected froma substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group.

In one or more embodiments, Ar₁ to Ar₃ may each independently beselected from:

-   -   a C₁-C₂₀ alkyl group, a C₂-C₂₀ alkenyl group, a C₂-C₂₀ alkynyl        group, and a C₁-C₂₀ alkoxy group;    -   a C₁-C₂₀ alkyl group, a C₂-C₂₀ alkenyl group, a C₂-C₂₀ alkynyl        group, and a C₁-C₂₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a cyclopentyl group, a cyclohexyl        group, a cycloheptyl group, a cycloctyl group, an adamantanyl        group, a norbornanyl group, a norbornenyl group, a cyclopentenyl        group, a cyclohexenyl group, a cycloheptenyl group, a phenyl        group, a naphthyl group, a pyridinyl group, a pyrimidinyl group,        —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁) and —P(═O)(Q₃₁)(Q₃₂);    -   a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a phenyl group, a pentalenyl group, an        indenyl group, a naphthyl group, a fluorenyl group, a        spiro-bifluorenyl group, a benzofluorenyl group, a        dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        pyrrolyl group, a furanyl group, a thiophenyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl        group, a naphthyridinyl group, a quinoxalinyl group, a        quinazolinyl group, a cinnolinyl group, a carbazolyl group, a        phenanthridinyl group, an acridinyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, a benzothiazolyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, and an        imidazopyrimidinyl group; and    -   a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a phenyl group, a pentalenyl group, an        indenyl group, a naphthyl group, a fluorenyl group, a        spiro-bifluorenyl group, a benzofluorenyl group, a        dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        pyrrolyl group, a furanyl group, a thiophenyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl        group, a naphthyridinyl group, a quinoxalinyl group, a        quinazolinyl group, a cinnolinyl group, a carbazolyl group, a        phenanthridinyl group, an acridinyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, a benzothiazolyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, and an        imidazopyrimidinyl group, each substituted with at least one        selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₂-C₂₀ alkenyl group,        a C₂-C₂₀ alkynyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl        group, a cyclohexyl group, a cycloheptyl group, a cycloctyl        group, an adamantanyl group, a norbornanyl group, a norbornenyl        group, a cyclopentenyl group, a cyclohexenyl group, a        cycloheptenyl group, a phenyl group, a pentalenyl group, an        indenyl group, a naphthyl group, a fluorenyl group, a        spiro-bifluorenyl group, a benzofluorenyl group, a        dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        pyrrolyl group, a furanyl group, a thiophenyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl        group, a naphthyridinyl group, a quinoxalinyl group, a        quinazolinyl group, a cinnolinyl group, a carbazolyl group, a        phenanthridinyl group, an acridinyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, a benzothiazolyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, an        imidazopyrimidinyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),        —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a cyano group, a C₁-C₂₀ alkyl        group, a C₂-C₂₀ alkenyl group, a C₂-C₂₀ alkynyl group, a C₁-C₂₀        alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₂₀ aryl group, a C₁-C₂₀        heteroaryl group, a monovalent non-aromatic condensed polycyclic        group, a monovalent non-aromatic condensed heteropolycyclic        group, a biphenyl group, and a terphenyl group.

In one or more embodiments, Ar₁ to Ar₃ may each independently beselected from:

-   -   a methyl group, —CD₃, an ethyl group, an n-propyl group, an        isopropyl group, an n-butyl group, an isobutyl group, a        sec-butyl group, a tert-butyl group, an n-pentyl group, an        isopentyl group, a sec-pentyl group, a tert-pentyl group, a        neopentyl group, an n-hexyl group, an isohexyl group, and a        phenyl group; and    -   a phenyl group substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a methyl group, —CD₃, an ethyl group, an n-propyl group,        an isopropyl group, an n-butyl group, an isobutyl group, a        sec-butyl group, a tert-butyl group, an n-pentyl group, an        isopentyl group, a sec-pentyl group, a tert-pentyl group, a        neopentyl group, an n-hexyl group, an isohexyl group, and a        phenyl group.

Ar₁ to Ar₃ may be identical to or different from each other. In one ormore embodiments, Ar₁ to Ar₃ may be identical to each other. Forexample, Ar₁ to Ar₃ may all be an isopropyl group, a phenyl group, a2,4-dimethylphenyl group, or a 2,4,6-trimethylphenyl group at the sametime.

In Formulae 1 and 2, R₁ to R₂₃ may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)₂(Q₁) and—P(═O)(Q₁)(Q₂),

-   -   R₁₆ and R₁₇, R₁₈ and R₁₉, and/or R₂₂ and R₂₃ may optionally be        linked to form a saturated ring or an unsaturated ring,    -   b20 may be an integer from 1 to 3, and    -   b21 may be an integer from 1 to 6.

In one or more embodiments, R₁ to R₂₃ may each independently be selectedfrom:

-   -   hydrogen, deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a methyl group, —CD₃, an ethyl group, an        n-propyl group, an isopropyl group, an n-butyl group, an        isobutyl group, a sec-butyl group, a tert-butyl group, an        n-pentyl group, an isopentyl group, a sec-pentyl group, a        tert-pentyl group, a neopentyl group, an n-hexyl group, an        isohexyl group, and a phenyl group; and    -   a phenyl group substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a methyl group, —CD₃, an ethyl group, an n-propyl group,        an isopropyl group, an n-butyl group, an isobutyl group, a        sec-butyl group, a tert-butyl group, an n-pentyl group, an        isopentyl group, a sec-pentyl group, a tert-pentyl group, a        neopentyl group, an n-hexyl group, an isohexyl group, and a        phenyl group.

In one or more embodiments, X₁ may be selected from O, S, N(R₁₆),C(R₁₆)(R₁₇), and Si(R₁₆)(R₁₇), X₂ may be selected from O, S, N(R₈),C(R₁₈)(R₁₉), and Si(R₁₈)(R₁), and X₃ may be selected from O, S, N(R₂₂),C(R₂₂)(R₂₃), and Si(R₂₂)(R₂₃),

-   -   R₁₆ to R₁₉, R₂₂, and R₂₃ may each independently be selected        from:    -   a methyl group, —CD₃, an ethyl group, an n-propyl group, an        isopropyl group, an n-butyl group, an isobutyl group, a        sec-butyl group, a tert-butyl group, an n-pentyl group, an        isopentyl group, a sec-pentyl group, a tert-pentyl group, a        neopentyl group, an n-hexyl group, an isohexyl group, and a        phenyl group; and    -   a phenyl group substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a methyl group, —CD₃, an ethyl group, an n-propyl group,        an isopropyl group, an n-butyl group, an isobutyl group, a        sec-butyl group, a tert-butyl group, an n-pentyl group, an        isopentyl group, a sec-pentyl group, a tert-pentyl group, a        neopentyl group, an n-hexyl group, an isohexyl group, and a        phenyl group.

In one or more embodiments, X₁ may be C(R₁₆)(R₁₇), R₁₆ and R₁₇ may eachindependently be a phenyl group, and R₁₆ and R₁₇ may be linked via asingle bond, i.e., a moiety including C(R₁₆)(R₁₇), may be represented bya fluorene ring.

In one or more embodiments, X₂ may be C(R₁₈)(R₁₉), R₁₈ and R₁₉ may eachindependently be a phenyl group, and R₁₈ and R₁₉ may be linked via asingle bond, i.e., a moiety including C(R₁₈)(R₁), may be represented bya fluorene ring.

In one or more embodiments, in Formula 1, at least one selected from R₁to R₁₅ may be a group represented by Formula 2A:

In Formula 2A,

-   -   X₃, L₁ to L₃, a1 to a3, Ar₃, R₂₀, R₂₁, b20, and b21 may each        independently be the same as described herein, and    -   indicates a binding site to a neighboring atom.

In one or more embodiments, in Formula 1, at least one selected from R₁to R₁₅ may be a group represented by Formula 2A-1:

In Formula 2A-1,

-   -   X₃, Ar₃, R₂₀, R₂₁, b20, and b21 may each independently be the        same as described herein, and    -   indicates a binding site to a neighboring atom.

In one or more embodiments, in Formula 1, at least one selected from R₁to R₁₅ may be selected from groups represented by Formulae 2A-2 to 2A-8:

In Formulae 2A-2 to 2A-8,

-   -   Ar₃ may be the same as described herein, and    -   indicates a binding site to a neighboring atom.

In one or more embodiments, the condensed cyclic compound may beselected from Compounds 1 to 117:

Because the condensed cyclic compound according to one or moreembodiments includes a condensed cyclic structure represented by Formula1, the condensed cyclic compound may have high oscillator strength dueto multiple resonance, and may have small ΔE_(st) because singlet andtriplet energy levels of a molecule do not overlap each other. In thisregard, reverse intersystem crossing from a triplet excited state to asinglet excited state through thermal activation may be possible even atroom temperature. Therefore, the condensed cyclic compound representedby Formula 1 may exhibit a delayed fluorescence. Because excitons in atriplet state are used for light emission, luminescent efficiency may beimproved.

For example, in the structure represented by Formula 1, because X₁ andX₂ are represented by atoms having electron donating characteristics,and because X₁ and X₂ are positioned para to a boron atom relative to abenzene moiety directly bonded to the boron atom (the benzene moietybeing between the boron atom and the respective one of X₁ and X₂),oscillator strength of the compound represented by Formula 1 may furtherincrease. The probability of having charge transfer characteristics in ahigh-order triplet phase more than T1 or more may increase, therebyhaving small E_(st).

In addition, in the structure represented by Formula 1, a decrease in T1energy of the condensed cyclic compound may be suppressed by an angle atwhich the condensed rings containing X₁ and X₂

are bonded with a neighboring 1,4-azaborine. Therefore, E_(st) of thecondensed cyclic compound according to one or more embodiments may bereduced. For example, in the structure of Formula 1-1 (when X₁ is N(R₁₆)and X₂ is N(R₁₈)), the condensed ring containing X₁ or X₂ has astructure in which amine (*—N(Ar₁)—*′ or *—N(Ar₂)—*′) is substituted at4-position of each carbazole ring. In this example, as illustratedbelow, due to a partial structure in which *—N(Ar₁)—*′ or *—N(Ar₂)—*′ isconnected to ortho position with respect to biphenyl, a decrease in T1energy may be reduced. Therefore, the condensed cyclic compoundaccording to one or more embodiments may have a relatively smallΔE_(st).

In addition, because the condensed cyclic compound represented byFormula 1 has a bulky structure, a distance between dopant molecules mayincrease, thereby reducing dexter energy transfer. Therefore, it ispossible to reduce lifespan deterioration caused by the increase oftriplet concentration, for example, lifespan deterioration caused bytriplet-triplet annihilation (TTA) and/or triplet-polaron quenching(TPQ).

For example, the condensed cyclic compound represented by Formula 1 maysatisfy Equation 1:ΔE _(st) =S1−T1≤0.4 eV.  Equation 1

In Equation 1, S1 is a singlet energy level of the condensed cycliccompound, and

T1 is a triplet energy level of the condensed cyclic compound.

Furthermore, the condensed cyclic compound may include a grouprepresented by Formula 2 in a molecular structure. In the grouprepresented by Formula 2, carbon atom (“C₄” in the drawing below) at aspecific position of a benzene moiety may be linked to a nitrogen atomof an amine group. For example, when the condensed ring including X₃ iscarbazole, 4-position of carbazole may be linked to nitrogen atom or anamine group. Due to such structural characteristics, the condensedcyclic compound may have relatively high triplet energy, as comparedwith a compound including amine in which carbon atom (e.g., “C₁”, “C₂”,and/or “C₃” carbon) at another position and a nitrogen atom are linked.It may be understood from the same viewpoint that the tendency fortriplet energy to increase is observed in the biphenyl structure as thelinking structure is changed in the order of para, meta, and ortho.According to one or more embodiments, because the condensed cycliccompound may have relatively small ΔE_(st), thermally activated delayedfluorescence characteristics may be improved.

The condensed cyclic group including a group represented by Formula 2has a relatively high probability of being positioned in a verticallycurved direction with respect to a plane including a core structure.This can cause steric hindrance to the molecule, thereby preventing orreducing access to neighboring molecules and reducing dexter energytransfer. Therefore, it is possible to reduce lifespan deteriorationcaused by the increase in triplet concentration as described above.

Furthermore, because the condensed cyclic compound represented byFormula 1 has a relatively high charge (hole or electron) transportcapability, an exciton formation ratio in an emission layer in anorganic light-emitting device including the condensed cyclic compoundrepresented by Formula 1 may be improved. Therefore, the organiclight-emitting device may have a low driving voltage, high efficiency, along lifespan, and high maximum quantum efficiency.

A synthesis method for the condensed cyclic compound represented byFormula 1 should be apparent to those of ordinary skill in the art byreferring to the following examples.

The condensed cyclic compound represented by Formula 1 may be usedbetween a pair of electrodes of an organic light-emitting device. Forexample, the condensed cyclic compound represented by Formula 1 may beincluded in at least one selected from a hole transport region, anelectron transport region, and an emission layer. In one or moreembodiments, the condensed cyclic compound represented by Formula 1 maybe used as a material for a capping layer located outside a pair ofelectrodes of an organic light-emitting device.

One or more embodiments of the present disclosure provide an organiclight-emitting device including: a first electrode; a second electrodefacing the first electrode; an organic layer between the first electrodeand the second electrode, the organic layer including an emission layerand at least one condensed cyclic compound represented by Formula 1.

In one or more embodiments, the first electrode may be an anode,

-   -   the second electrode may be a cathode,    -   the organic layer may include the condensed cyclic compound,    -   the organic layer may further include a hole transport region        between the first electrode and the emission layer and an        electron transport region between the emission layer and the        second electrode,    -   the hole transport region may include a hole injection layer, a        hole transport layer, an emission auxiliary layer, an electron        blocking layer, or any combination thereof, and    -   the electron transport region may include a hole blocking layer,        an electron transport layer, an electron injection layer, or any        combination thereof.

In one or more embodiments, the emission layer of the organiclight-emitting device may include at least one condensed cycliccompound. The condensed cyclic compound included in the emission layermay act as a thermally activated delayed fluorescence (TADF) emitter, sothat the emission layer may emit delayed fluorescence.

In one or more embodiments, the emission layer of the organiclight-emitting device may include at least one condensed cycliccompound, and may further include a host. Here, the host may include atleast one selected from an anthracene-based compound, a pyrene-basedcompound, a spiro-bifluorene-based compound, a carbazole-based compound,a benzimidazole-based compound, and a phosphine oxide-based compound. Anamount of the host included in the emission layer may be greater thanthat of the condensed cyclic compound included in the emission layer.For example, the amount of the host may be in a range of about 0.1 partsby weight to about 30 parts by weight based on 100 parts by weight ofthe emission layer.

In one or more embodiments, the emission layer of the organiclight-emitting device may include the condensed cyclic compound, and mayemit blue light having a wavelength of maximum emission of 420 nm ormore and 480 nm or less.

In one or more embodiments, the hole transport region of the organiclight-emitting device may include a hole transport layer, and the holetransport layer may include a first hole transport layer and a secondhole transport layer.

The term “an organic layer” as used herein may refer to a single layerand/or a plurality of layers disposed (located) between the firstelectrode and the second electrode of an organic light-emitting device.A material included in the “organic layer” is not limited to an organicmaterial.

Description of FIG. 1

FIG. 1 is a schematic cross-sectional view of an organic light-emittingdevice 10 according to an embodiment. The organic light-emitting device10 includes a first electrode 110, an organic layer 150, and a secondelectrode 190.

Hereinafter, the structure of the organic light-emitting device 10according to an embodiment and a method of manufacturing the organiclight-emitting device 10 will be described in connection with FIG. 1 .

First Electrode 110

In FIG. 1 , a substrate may be additionally disposed under the firstelectrode 110 or above the second electrode 190. The substrate may be aglass substrate or a plastic substrate, each having excellent (orsuitable) mechanical strength, thermal stability, transparency, surfacesmoothness, ease of handling, and/or water resistance.

The first electrode 110 may be formed by depositing or sputtering amaterial for forming the first electrode 110 on the substrate. When thefirst electrode 110 is an anode, the material for forming the firstelectrode 110 may be selected from materials with a high work functionto facilitate hole injection.

The first electrode 110 may be a reflective electrode, asemi-retransmissive electrode, or a transmissive electrode. When thefirst electrode 110 is a transmissive electrode, a material for formingthe first electrode 110 may be selected from indium tin oxide (ITO),indium zinc oxide (IZO), tin oxide (SnO₂), zinc oxide (ZnO), and anycombinations thereof, but embodiments of the present disclosure are notlimited thereto. In one or more embodiments, when the first electrode110 is a semi-transmissive electrode or a reflective electrode, amaterial for forming the first electrode 110 may be selected frommagnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al—Li),calcium (Ca), magnesium-indium (Mg—In), magnesium-silver (Mg—Ag), andany combinations thereof, but embodiments of the present disclosure arenot limited thereto.

The first electrode 110 may have a single-layered structure, or amulti-layered structure including two or more layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but the structure of the first electrode 110 is not limited thereto.

Organic Layer 150

The organic layer 150 may be disposed on the first electrode 110. Theorganic layer 150 may include an emission layer.

The organic layer 150 may further include a hole transport regionbetween the first electrode 110 and the emission layer and an electrontransport region between the emission layer and the second electrode190.

Hole Transport Region in Organic Layer 150

The hole transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The hole transport region may include at least one layer selected from ahole injection layer, a hole transport layer, an emission auxiliarylayer, and an electron blocking layer.

For example, the hole transport region may have a single-layeredstructure including a single layer including a plurality of differentmaterials, or a multi-layered structure having a hole injectionlayer/hole transport layer structure, a hole injection layer/holetransport layer/emission auxiliary layer structure, a hole injectionlayer/emission auxiliary layer structure, a hole transportlayer/emission auxiliary layer structure, or a hole injection layer/holetransport layer/electron blocking layer structure, wherein for eachstructure, constituting layers are sequentially stacked from the firstelectrode 110 in this stated order, but the structure of the holetransport region is not limited thereto.

The hole transport region may include at least one selected fromm-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, spiro-TPD, spiro-NPB,methylated NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine(TCTA), polyaniline/dodecylbenzenesulfonicacid (PANI/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)(PEDOT/PSS),polyaniline/camphor sulfonic acid (PANI/CSA),polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound representedby Formula 201, and a compound represented by Formula 202:

In Formulae 201 an 202,

-   -   L₂₀₁ to L₂₀₄ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   L₂₀₅ may be selected from *—O—*′, *—S—*′, *—N(Q₂₀₁)-*′, a        substituted or unsubstituted C₁-C₂₀ alkylene group, a        substituted or unsubstituted C₂-C₂₀ alkenylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   xa1 to xa4 may each independently be an integer from 0 to 3,    -   xa5 may be an integer from 1 to 10, and    -   R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group.

For example, in Formula 202, R₂₀₁ and R₂₀₂ may optionally be linked viaa single bond, a dimethyl-methylene group, or a diphenyl-methylenegroup, and R₂₀₃ and R₂₀₄ may optionally be linked via a single bond, adimethyl-methylene group, or a diphenyl-methylene group.

In one or more embodiments, in Formulae 201 and 202,

-   -   L₂₀₁ to L₂₀₅ may each independently be selected from:    -   a phenylene group, a pentalenylene group, an indenylene group, a        naphthylene group, an azulenylene group, a heptalenylene group,        an indacenylene group, an acenaphthylene group, a fluorenylene        group, a spiro-bifluorenylene group, a benzofluorenylene group,        a dibenzofluorenylene group, a phenalenylene group, a        phenanthrenylene group, an anthracenylene group, a        fluoranthenylene group, a triphenylenylene group, a pyrenylene        group, a chrysenylene group, a naphthacenylene group, a        picenylene group, a perylenylene group, a pentaphenylene group,        a hexacenylene group, a pentacenylene group, a rubicenylene        group, a coronenylene group, an ovalenylene group, a        thiophenylene group, a furanylene group, a carbazolylene group,        an indolylene group, an isoindolylene group, a benzofuranylene        group, a benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group; and    -   a phenylene group, a pentalenylene group, an indenylene group, a        naphthylene group, an azulenylene group, a heptalenylene group,        an indacenylene group, an acenaphthylene group, a fluorenylene        group, a spiro-bifluorenylene group, a benzofluorenylene group,        a dibenzofluorenylene group, a phenalenylene group, a        phenanthrenylene group, an anthracenylene group, a        fluoranthenylene group, a triphenylenylene group, a pyrenylene        group, a chrysenylene group, a naphthacenylene group, a        picenylene group, a perylenylene group, a pentaphenylene group,        a hexacenylene group, a pentacenylene group, a rubicenylene        group, a coronenylene group, an ovalenylene group, a        thiophenylene group, a furanylene group, a carbazolylene group,        an indolylene group, an isoindolylene group, a benzofuranylene        group, a benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

In one or more embodiments, xa1 to xa4 may each independently be 0, 1,or 2.

In one or more embodiments, xa5 may be 1, 2, 3, or 4.

In one or more embodiments, R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independentlybe selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group, each substituted with at least one selected from        deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ are the same as described above.

In one or more embodiments, in Formula 201, at least one selected fromR₂₀₁ to R₂₀₃ may each independently be selected from:

-   -   a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl        group, a dibenzofuranyl group, and a dibenzothiophenyl group;        and    -   a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl        group, a dibenzofuranyl group, and a dibenzothiophenyl group,        each substituted with at least one selected from deuterium, —F,        —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an        amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀        alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a        cyclohexenyl group, a phenyl group, a biphenyl group, a        terphenyl group, a phenyl group substituted with a C₁-C₁₀ alkyl        group, a phenyl group substituted with —F, a naphthyl group, a        fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group,        a dibenzofuranyl group, and a dibenzothiophenyl group,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, in Formula 202, i) R₂₀₁ and R₂₀₂ may belinked via a single bond, and/or ii) R₂₀₃ and R₂₀₄ may be linked via asingle bond.

In one or more embodiments, at least one selected from R₂₀₁ to R₂₀₄ inFormula 202 may be selected from:

-   -   a carbazolyl group; and    -   a carbazolyl group substituted with at least one selected from        deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a        carbazolyl group, a dibenzofuranyl group, and a        dibenzothiophenyl group,    -   but embodiments of the present disclosure are not limited        thereto.

The compound represented by Formula 201 may be represented by Formula201-1 below:

For example, the compound represented by Formula 201 may be representedby Formula 201-2 below, but embodiments of the present disclosure arenot limited thereto:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201-2(1) below, but embodiments of the presentdisclosure are not limited thereto:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201A below:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201A(1) below, but embodiments of the presentdisclosure are not limited thereto:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201A-1 below, but embodiments of the presentdisclosure are not limited thereto:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202-1 below:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202-1 (1) below:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202A below:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202A-1 below:

In Formulae 201-1, 201-2, 201-2(1), 201A, 201A(1), 201A-1, 202-1,202-1(1), 202A, and 202A-1,

-   -   L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, and R₂₀₂ to R₂₀₄ are the same as        described above,    -   L₂₀₅ may be selected from a phenylene group and a fluorenylene        group,    -   X₂₁₁ may be selected from O, S, and N(R₂₁₁),    -   X₂₁₂ may be selected from O, S, and N(R₂₁₂),    -   R₂₁₁ and R₂₁₂ may each independently be the same as defined in        connection with R₂₀₃, and    -   R₂₁₃ to R₂₁₇ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group.

The hole transport region may include at least one compound selectedfrom Compounds HT1 to HT48, but embodiments of the present disclosureare not limited thereto:

A thickness of the hole transport region may be from about 100 Å toabout 10,000 Å, for example, about 100 Å to about 3,000 Å. When the holetransport region includes at least one selected from a hole injectionlayer and a hole transport layer, a thickness of the hole injectionlayer may be in a range of about 100 Å to about 9,000 Å, for example,about 100 Å to about 1,000 Å, and a thickness of the hole transportlayer may be in a range of about 50 Å to about 2,000 Å, for exampleabout 100 Å to about 1,500 Å. When the thicknesses of the hole transportregion, the hole injection layer, and the hole transport layer arewithin any of these ranges, satisfactory (or suitable) hole transportingcharacteristics may be obtained without a substantial increase indriving voltage.

The emission auxiliary layer may increase light-emission efficiency bycompensating for an optical resonance distance according to thewavelength of light emitted by an emission layer, and the electronblocking layer may block or reduce the flow of electrons from anelectron transport region. The emission auxiliary layer and the electronblocking layer may each independently include any of the materialsdescribed above.

p-Dopant

The hole transport region may further include, in addition to thematerials described above, a charge-generation material for theimprovement of conductive properties. The charge-generation material maybe homogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant.

In one or more embodiments, the p-dopant may have a lowest unoccupiedmolecular orbital (LUMO) energy level of −3.5 eV or less.

The p-dopant may include at least one selected from a quinonederivative, a metal oxide, and a cyano group-containing compound, butembodiments of the present disclosure are not limited thereto.

In one or more embodiments, the p-dopant may include at least oneselected from:

-   -   a quinone derivative, such as tetracyanoquinodimethane (TCNQ)        and/or 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane        (F4-TCNQ);    -   a metal oxide, such as tungsten oxide and/or molybdenum oxide;    -   1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN); and    -   a compound represented by Formula 221,    -   but embodiments of the present disclosure are not limited        thereto:

In Formula 221,

-   -   R₂₂₁ to R₂₂₃ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, wherein at least        one selected from R₂₂₁ to R₂₂₃ may have at least one substituent        selected from a cyano group, —F, —C, —Br, —I, a C₁-C₂₀ alkyl        group substituted with —F, a C₁-C₂₀ alkyl group substituted with        —Cl, a C₁-C₂₀ alkyl group substituted with —Br, and a C₁-C₂₀        alkyl group substituted with —I.        Emission Layer in Organic Layer 150

When the organic light-emitting device 10 is a full-color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, or a blue emission layer,according to a sub-pixel. In one or more embodiments, the emission layermay have a stacked structure of two or more layers selected from a redemission layer, a green emission layer, and a blue emission layer, inwhich the two or more layers contact each other or are separated fromeach other. In one or more embodiments, the emission layer may includetwo or more materials selected from a red light-emitting material, agreen light-emitting material, and a blue light-emitting material, inwhich the two or more materials are mixed with each other in a singlelayer to emit white light.

The emission layer may include a host and a dopant. The dopant mayinclude at least one selected from a phosphorescent dopant and afluorescent dopant.

In the emission layer, an amount of the dopant may be in a range ofabout 0.01 parts by weight to about 15 parts by weight based on 100parts by weight of the host, but embodiments of the present disclosureare not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. When thethickness of the emission layer is within this range, excellent (orsuitable) light-emission characteristics may be obtained without asubstantial increase in driving voltage.

Host in Emission Layer

In one or more embodiments, the host may include a compound representedby Formula 301 below:[Ar₃₀₁]_(xb11)-[(L₃₀₁)_(xb1)-R₃₀₁]_(xb21).  Formula 301

In Formula 301,

-   -   Ar₃₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   xb11 may be 1, 2, or 3,    -   L₃₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀        cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenylene group, a substituted or unsubstituted        C₆-C₆₀ arylene group, a substituted or unsubstituted C₁-C₆₀        heteroarylene group, a substituted or unsubstituted divalent        non-aromatic condensed polycyclic group, and a substituted or        unsubstituted divalent non-aromatic condensed heteropolycyclic        group,    -   xb1 may be an integer from 0 to 5,    -   R₃₀₁ may be selected from deuterium, —F, —Cl, —Br, —I, a        hydroxyl group, a cyano group, a nitro group, an amidino group,        a hydrazino group, a hydrazono group, a substituted or        unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted        C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀        alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy        group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, a substituted or unsubstituted monovalent non-aromatic        condensed heteropolycyclic group, —Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃),        —N(Q₃₀₁)(Q₃₀₂), —B(Q₃₀₁)(Q₃₀₂), —C(═O)(Q₃₀₁), —S(═O)₂(Q₃₀₁), and        —P(═O)(Q₃₀₁)(Q₃₀₂),    -   xb21 may be an integer from 1 to 5, and    -   Q₃₀₁ to Q₃₀₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group, but embodiments        of the present disclosure are not limited thereto.

In one or more embodiments, Ar₃₀₁ in Formula 301 may be selected from:

-   -   a naphthalene group, a fluorene group, a spiro-bifluorene group,        a benzofluorene group, a dibenzofluorene group, a phenalene        group, a phenanthrene group, an anthracene group, a fluoranthene        group, a triphenylene group, a pyrene group, a chrysene group, a        naphthacene group, a picene group, a perylene group, a        pentaphene group, an indenoanthracene group, a dibenzofuran        group, and a dibenzothiophene group; and    -   a naphthalene group, a fluorene group, a spiro-bifluorene group,        a benzofluorene group, a dibenzofluorene group, a phenalene        group, a phenanthrene group, an anthracene group, a fluoranthene        group, a triphenylene group, a pyrene group, a chrysene group, a        naphthacene group, a picene group, a perylene group, a        pentaphene group, an indenoanthracene group, a dibenzofuran        group, and a dibenzothiophene group, each substituted with at        least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl        group, a cyano group, a nitro group, an amidino group, a        hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a        C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),        —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and        —P(═O)(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group, but embodiments        of the present disclosure are not limited thereto.

When xb11 in Formula 301 is two or more, two or more Ar₃₀₁(s) may belinked via a single bond.

In one or more embodiments, the compound represented by Formula 301 maybe represented by Formulae 301-1 or 301-2 below:

In Formulae 301-1 to 301-2,

-   -   ring A₃₀₁ to ring A₃₀₄ may each independently be selected from a        benzene ring, a naphthalene ring, a phenanthrene ring, a        fluoranthene ring, a triphenylene ring, a pyrene ring, a        chrysene ring, a pyridine ring, a pyrimidine ring, an indene        ring, a fluorene ring, a spiro-bifluorene ring, a benzofluorene        ring, a dibenzofluorene ring, an indole ring, a carbazole ring,        a benzocarbazole ring, a dibenzocarbazole ring, a furan ring, a        benzofuran ring, a dibenzofuran ring, a naphthofuran ring, a        benzonaphthofuran ring, a dinaphthofuran ring, a thiophene ring,        a benzothiophene ring, a dibenzothiophene ring, a        naphthothiophene ring, a benzonaphthothiophene ring, and a        dinaphthothiophene ring,    -   X₃₀₁ may be O, S, or N-[(L₃₀₄)_(xb4)-R₃₀₄],    -   R₃₁₁ to R₃₁₄ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, a naphthyl group        —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),    -   xb22 and xb23 may each independently be 0, 1, or 2,    -   L₃₀₁, xb1, R₃₀₁, and Q₃₁ to Q₃₃ may be understood by referring        to corresponding descriptions presented herein,    -   L₃₀₂ to L₃₀₄ may each independently be the same as defined in        connection with L₃₀₁,    -   xb2 to xb4 may each independently be the same as defined in        connection with xb1, and    -   R₃₀₂ to R₃₀₄ may each independently be the same as defined in        connection with R₃₀₁.

For example, L₃₀₁ to L₃₀₄ in Formulae 301, 301-1, and 301-2 may eachindependently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isoxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isoxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group, each substituted with at least one        selected from deuterium, —F, —C, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, an        azacarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),        —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ are the same as described above.

In one or more embodiments, R₃₀₁ to R₃₀₄ in Formulae 301, 301-1, and301-2 may each independently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, an        azacarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),        —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ are the same as described above.

In one or more embodiments, the host may include an alkaline earth-metalcomplex. For example, the host may be selected from a Be complex (forexample, Compound H55), a Mg complex, and a Zn complex.

The host may include at least one selected from9,10-di(2-naphthyl)anthracene (ADN),2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN),9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN),4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), 1,3-di-9-carbazolylbenzene(mCP), 1,3,5-tri(carbazol-9-yl)benzene (TCP), and Compounds H1 to H55,but embodiments of the present disclosure are not limited thereto:

Phosphorescent Dopant Included in Emission Layer in Organic Layer 150

The phosphorescent dopant may include an organometallic complexrepresented by Formula 401 below:

In Formulae 401 and 402,

-   -   M may be selected from iridium (Ir), platinum (Pt), palladium        (Pd), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf),        europium (Eu), terbium (Tb), rhodium (Rh), and thulium (Tm),    -   L₄₀₁ may be selected from ligands represented by Formula 402,        and xc1 may be 1, 2, or 3, wherein, when xc1 is two or more, two        or more L₄₀₁(s) may be identical to or different from each        other,    -   L₄₀₂ may be an organic ligand, and xc2 may be an integer from 0        to 4, wherein, when xc2 is two or more, two or more L₄₀₂(s) may        be identical to or different from each other    -   X₄₀₁ to X₄₀₄ may each independently be nitrogen or carbon,    -   X₄₀₁ and X₄₀₃ may be linked via a single bond or a double bond,        and X₄₀₂ and X₄₀₄ may be linked via a single bond or a double        bond,    -   A₄₀₁ and A₄₀₂ may each independently be selected from a C₅-C₆₀        carbocyclic group and a C₁-C₆₀ heterocyclic group,    -   X₄₀₅ may be a single bond, *—O—*′, *—S—*′, *—C(═O)—*′,        *—N(Q₄₁₁)-*′, *—C(Q₄₁₁)(Q₄₁₂)*, *C(Q₄₁₁)=(Q₄₁₂)-*′,        *—C(Q₄₁₁)=*′, or *═C═*′, wherein Q₄₁₁ and Q₄₁₂ may each        independently be hydrogen, deuterium, a C₁-C₂₀ alkyl group, a        C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, or a naphthyl group,    -   X₄₀₆ may be a single bond, O, or S,    -   R₄₀₁ and R₄₀₂ may each independently be selected from hydrogen,        deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a substituted or unsubstituted C₁-C₂₀ alkyl group, a        substituted or unsubstituted C₁-C₂₀ alkoxy group, a substituted        or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,        —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃), —N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂),        —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and —P(═O)(Q₄₀₁)(Q₄₀₂), wherein        Q₄₀₁ to Q₄₀₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a C₆-C₂₀ aryl group, and a        C₁-C₂₀ heteroaryl group,    -   xc11 and xc12 may each independently be an integer from 0 to 10,        and    -   * and *′ in Formula 402 each indicate a binding site to M in        Formula 401.

In one or more embodiments, A₄₀₁ and A₄₀₂ in Formula 402 may eachindependently be selected from a benzene group, a naphthalene group, afluorene group, a spiro-bifluorene group, an indene group, a pyrrolegroup, a thiophene group, a furan group, an imidazole group, a pyrazolegroup, a thiazole group, an isothiazole group, an oxazole group, anisoxazole group, a pyridine group, a pyrazine group, a pyrimidine group,a pyridazine group, a quinoline group, an isoquinoline group, abenzoquinoline group, a quinoxaline group, a quinazoline group, acarbazole group, a benzimidazole group, a benzofuran group, abenzothiophene group, an isobenzothiophene group, a benzoxazole group,an isobenzoxazole group, a triazole group, a tetrazole group, anoxadiazole group, a triazine group, a dibenzofuran group, and adibenzothiophene group.

In one or more embodiments, in Formula 402, i) X₄₀₁ may be nitrogen, andX₄₀₂ may be carbon, or ii) X₄₀₁ and X₄₀₂ may each be nitrogen at thesame time.

In one or more embodiments, R₄₀₁ and R₄₀₂ in Formula 402 may eachindependently be selected from:

-   -   hydrogen, deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy        group;    -   a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted        with at least one selected from deuterium, —F, —Cl, —Br, —I, a        hydroxyl group, a cyano group, a nitro group, an amidino group,        a hydrazino group, a hydrazono group, a phenyl group, a naphthyl        group, a cyclopentyl group, a cyclohexyl group, an adamantanyl        group, a norbornanyl group, and a norbornenyl group;    -   a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl        group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl        group, a pyridazinyl group, a triazinyl group, a quinolinyl        group, an isoquinolinyl group, a quinoxalinyl group, a        quinazolinyl group, a carbazolyl group, a dibenzofuranyl group,        and a dibenzothiophenyl group;    -   a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl        group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl        group, a pyridazinyl group, a triazinyl group, a quinolinyl        group, an isoquinolinyl group, a quinoxalinyl group, a        quinazolinyl group, a carbazolyl group, a dibenzofuranyl group,        and a dibenzothiophenyl group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy        group, a cyclopentyl group, a cyclohexyl group, an adamantanyl        group, a norbornanyl group, a norbornenyl group, a phenyl group,        a biphenyl group, a terphenyl group, a naphthyl group, a        fluorenyl group, a pyridinyl group, a pyrazinyl group, a        pyrimidinyl group, a pyridazinyl group, a triazinyl group, a        quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,        a quinazolinyl group, a carbazolyl group, a dibenzofuranyl        group, and a dibenzothiophenyl group; and    -   —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃), —N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂),        —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and —P(═O)(Q₄₀₁)(Q₄₀₂), and

Q₄₀₁ to Q₄₀₃ may each independently be selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, and anaphthyl group, but embodiments of the present disclosure are notlimited thereto.

In one or more embodiments, when xc1 in Formula 401 is two or more, twoA₄₀₁(s) in two or more L₄₀₁(s) may optionally be linked via X₄₀₇, whichis a linking group, or two A₄₀₂(s) in two or more L₄₀₁(s) may optionallybe linked via X₄₀₈, which is a linking group (see e.g., Compounds PD1 toPD4 and PD7). X₄₀₇ and X₄₀₈ may each independently be a single bond,*—O—*′, *—S—*′, *—C(═O)—*′, *—N(Q₄₁₃)-*′, *—C(Q₄₁₃)(Q₄₁₄)-*′, or*—C(Q₄₁₃)═C(Q₄₁₄)-*′ (wherein Q₄₁₃ and Q₄₁₄ may each independently behydrogen, deuterium, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, or a naphthyl group),but embodiments of the present disclosure are not limited thereto.

L₄₀₂ in Formula 401 may be a monovalent, divalent, or trivalent organicligand. For example, L₄₀₂ may be halogen, diketone (for example,acetylacetonate), carboxylic acid (for example, picolinate), —C(═O),isonitrile, —CN, and phosphorus (for example, phosphine and/orphosphite), but embodiments of the present disclosure are not limitedthereto.

In one or more embodiments, the phosphorescent dopant may be selectedfrom, for example, Compounds PD1 to PD25, but embodiments of the presentdisclosure are not limited thereto:

Fluorescent Dopant in Emission Layer

The fluorescent dopant may include the condensed cyclic compoundrepresented by Formula 1, which may act as a TADF emitter.

The fluorescent dopant may further include an arylamine compound and/ora styrylamine compound.

The fluorescent dopant may include a compound represented by Formula 501below:

In Formula 501,

-   -   Ar₅₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   L₅₀₁ to L₅₀₃ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   xd1 to xd3 may each independently be an integer from 0 to 3,    -   R₅₀₁ and R₅₀₂ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, and    -   xd4 may be an integer from 1 to 6.

In one or more embodiments, Ar₅₀₁ in Formula 501 may be selected from:

-   -   a naphthalene group, a heptalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group,        and an indenophenanthrene group; and    -   a naphthalene group, a heptalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group,        and an indenophenanthrene group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy        group, a phenyl group, a biphenyl group, a terphenyl group, and        a naphthyl group.

In one or more embodiments, L₅₀₁ to L₅₀₃ in Formula 501 may eachindependently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group, each substituted with at least one selected        from deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group.

In one or more embodiments, R₅₀₁ and R₅₀₂ in Formula 501 may eachindependently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group, each substituted with at least one selected from        deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, a naphthyl group, a        fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl        group, a dibenzofluorenyl group, a phenanthrenyl group, an        anthracenyl group, a fluoranthenyl group, a triphenylenyl group,        a pyrenyl group, a chrysenyl group, a perylenyl group, a        pentaphenyl group, a hexacenyl group, a pentacenyl group, a        thiophenyl group, a furanyl group, a carbazolyl group, an        indolyl group, an isoindolyl group, a benzofuranyl group, a        benzothiophenyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, and —Si(Q₃₁)(Q₃₂)(Q₃₃), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

In one or more embodiments, xd4 in Formula 501 may be 2, but embodimentsof the present disclosure are not limited thereto.

For example, the fluorescent dopant may be selected from Compounds FD1to FD22:

In one or more embodiments, the fluorescent dopant may be selected fromthe following compounds, but embodiments of the present disclosure arenot limited thereto:

Electron Transport Region in Organic Layer 150

The electron transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron transport region may include at least one selected from abuffer layer, a hole blocking layer, an electron control layer, anelectron transport layer, and an electron injection layer, butembodiments of the present disclosure are not limited thereto.

For example, the electron transport region may have an electrontransport layer/electron injection layer structure, a hole blockinglayer/electron transport layer/electron injection layer structure, anelectron control layer/electron transport layer/electron injection layerstructure, or a buffer layer/electron transport layer/electron injectionlayer structure, wherein for each structure, constituting layers aresequentially stacked from an emission layer. However, embodiments of thestructure of the electron transport region are not limited thereto.

The electron transport region (for example, a buffer layer, a holeblocking layer, an electron control layer, and/or an electron transportlayer in the electron transport region) may include a metal-freecompound containing at least one π electron-depleted nitrogen-containingring.

The “π electron-depleted nitrogen-containing ring” may refer to a C₁-C₆₀heterocyclic group having at least one *—N═*′ moiety as a ring-formingmoiety.

For example, the “π electron-depleted nitrogen-containing ring” may bei) a 5-membered to 7-membered heteromonocyclic group having at least one*—N═*′ moiety, ii) a heteropolycyclic group in which two or more5-membered to 7-membered heteromonocyclic groups each having at leastone *—N═*′ moiety are condensed with each other, or iii) aheteropolycyclic group in which at least one of 5-membered to 7-memberedheteromonocyclic groups, each having at least one *—N═*′ moiety, iscondensed with at least one C₅-C₆₀ carbocyclic group.

Examples of the π electron-depleted nitrogen-containing ring include animidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, anisoxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, anindazole, a purine, a quinoline, an isoquinoline, a benzoquinoline, aphthalazine, a naphthyridine, a quinoxaline, a quinazoline, a cinnoline,a phenanthridine, an acridine, a phenanthroline, a phenazine, abenzimidazole, an isobenzothiazole, a benzoxazole, an isobenzoxazole, atriazole, a tetrazole, an oxadiazole, a triazine, a thiadiazole, animidazopyridine, an imidazopyrimidine, and an azacarbazole, but are notlimited thereto.

For example, the electron transport region may include a compoundrepresented by Formula 601 below:[Ar₆₀₁]_(xe11)-[(L₆₀₁)_(xe1)-R₆₀₁]_(xe21).  Formula 601

In Formula 601,

-   -   Ar₆₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   xe11 may be 1, 2, or 3,    -   L₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀        cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenylene group, a substituted or unsubstituted        C₆-C₆₀ arylene group, a substituted or unsubstituted C₁-C₆₀        heteroarylene group, a substituted or unsubstituted divalent        non-aromatic condensed polycyclic group, and a substituted or        unsubstituted divalent non-aromatic condensed heteropolycyclic        group,    -   xe1 may be an integer from 0 to 5,    -   R₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkyl group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀        cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀        aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group,        a substituted or unsubstituted C₆-C₆₀ arylthio group, a        substituted or unsubstituted C₁-C₆₀ heteroaryl group, a        substituted or unsubstituted monovalent non-aromatic condensed        polycyclic group, a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₆₀₁)(Q₆₀₂)(Q₆₀₃), —C(═O)(Q₆₀₁), —S(═O)₂(Q₆₀₁), and        —P(═O)(Q₆₀₁)(Q₆₀₂),    -   Q₆₀₁ to Q₆₀₃ may each independently be a C₁-C₁₀ alkyl group, a        C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, or a naphthyl group, and    -   xe21 may be an integer from 1 to 5.

In one or more embodiments, at least one selected from Ar₆₀₁(s) in thenumber of xe11 and R₆₀₁(s) in the number of xe21 may include the πelectron-depleted nitrogen-containing ring.

In one or more embodiments, Ar₆₀₁ in Formula 601 may be selected from:

-   -   a benzene group, a naphthalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group, a        dibenzofuran group, a dibenzothiophene group, a carbazole group,        an imidazole group, a pyrazole group, a thiazole group, an        isothiazole group, an oxazole group, an isoxazole group, a        pyridine group, a pyrazine group, a pyrimidine group, a        pyridazine group, an indazole group, a purine group, a quinoline        group, an isoquinoline group, a benzoquinoline group, a        phthalazine group, a naphthyridine group, a quinoxaline group, a        quinazoline group, a cinnoline group, a phenanthridine group, an        acridine group, a phenanthroline group, a phenazine group, a        benzimidazole group, an isobenzothiazole group, a benzoxazole        group, an isobenzoxazole group, a triazole group, a tetrazole        group, an oxadiazole group, a triazine group, a thiadiazole        group, an imidazopyridine group, an imidazopyrimidine group, and        an azacarbazole group; and    -   a benzene group, a naphthalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group, a        dibenzofuran group, a dibenzothiophene group, a carbazole group,        an imidazole group, a pyrazole group, a thiazole group, an        isothiazole group, an oxazole group, an isoxazole group, a        pyridine group, a pyrazine group, a pyrimidine group, a        pyridazine group, an indazole group, a purine group, a quinoline        group, an isoquinoline group, a benzoquinoline group, a        phthalazine group, a naphthyridine group, a quinoxaline group, a        quinazoline group, a cinnoline group, a phenanthridine group, an        acridine group, a phenanthroline group, a phenazine group, a        benzimidazole group, an isobenzothiazole group, a benzoxazole        group, an isobenzoxazole group, a triazole group, a tetrazole        group, an oxadiazole group, a triazine group, a thiadiazole        group, an imidazopyridine group, an imidazopyrimidine group, and        an azacarbazole group, each substituted with at least one        selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

When xe11 in Formula 601 is 2 or more, two or more Ar₆₀₁(s) may belinked via a single bond.

In one or more embodiments, Ar₆₀₁ in Formula 601 may be an anthracenegroup.

In one or more embodiments, the compound represented by Formula 601 maybe represented by Formula 601-1 below:

In Formula 601-1,

-   -   X₆₁₄ may be N or C(R₆₁₄), X₆₁₅ may be N or C(R₆₁₅), and X₆₁₆ may        be N or C(R₆₁₆), wherein at least one selected from X₆₁₄ to X₆₁₆        may be N,    -   L₆₁ to L₆₁₃ may each independently be the same as defined in        connection with L₆₀₁,    -   xe611 to xe613 may each independently be the same as defined in        connection with xe1,    -   R₆₁₁ to R₆₁₃ may each independently be the same as defined in        connection with R₆₀₁, and    -   R₆₁₄ to R₆₁₆ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, and a naphthyl        group.

In one or more embodiments, L₆₀₁ and L₆₁₁ to L₆₁₃ in Formulae 601 and601-1 may each independently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isoxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isoxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group, each substituted with at least one        selected from deuterium, —F, —C, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and601-1 may each independently be 0, 1, or 2.

In one or more embodiments, R₆₀₁ and R₆₁ to R₆₁₃ in Formulae 601 and601-1 may each independently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group;    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group; and

—S(═O)₂(Q₆₀₁) and —P(═O)(Q₆₀₁)(Q₆₀₂), and

-   -   Q₆₀₁ and Q₆₀₂ are the same as described above.

The electron transport region may include at least one compound selectedfrom Compounds ET1 to ET36, but embodiments of the present disclosureare not limited thereto:

In one or more embodiments, the electron transport region may include atleast one selected from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP), 4,7-dphenyl-1,10-phenanthroline (Bphen), Alq₃, BAlq,3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ), and NTAZ:

A thickness of the buffer layer, the hole blocking layer, and/or theelectron control layer may each independently be in a range of about 20Å to about 1,000 Å, for example, about 30 Å to about 300 Å. When thethicknesses of the buffer layer, the hole blocking layer, and/or theelectron control layer are within any of these ranges, the electrontransport region may have excellent (or suitable) hole blockingcharacteristics and/or electron control characteristics without asubstantial increase in driving voltage.

A thickness of the electron transport layer may be from about 100 Å toabout 1,000 Å, for example, about 150 Å to about 500 Å. When thethickness of the electron transport layer is within the range describedabove, satisfactory (or suitable) electron transport characteristics maybe obtained without a substantial increase in driving voltage.

The electron transport region (for example, the electron transport layerin the electron transport region) may further include, in addition tothe materials described above, a metal-containing material.

The metal-containing material may include at least one selected fromalkali metal complex and alkaline earth-metal complex. The alkali metalcomplex may include a metal ion selected from a Li ion, a Na ion, a Kion, a Rb ion, and a Cs ion, and the alkaline earth-metal complex mayinclude a metal ion selected from a Be ion, a Mg ion, a Ca ion, a Srion, and a Ba ion. A ligand coordinated with the metal ion of the alkalimetal complex or the alkaline earth-metal complex may be selected from ahydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, ahydroxy acridine, a hydroxy phenanthridine, a hydroxyphenyl oxazole, ahydroxyphenyl thiazole, a hydroxyphenyl oxadiazole, a hydroxyphenylthiadiazole, a hydroxyphenyl pyridine, a hydroxyphenyl benzimidazole, ahydroxyphenyl benzothiazole, a bipyridine, a phenanthroline, and acyclopentadiene, but embodiments of the present disclosure are notlimited thereto.

For example, the metal-containing material may include a Li complex. TheLi complex may include, for example, Compound ET-D1 (lithium quinolate,LiQ) and/or ET-D2:

The electron transport region may include an electron injection layerthat facilitates electron injection from the second electrode 190. Theelectron injection layer may directly contact the second electrode 190.

The electron injection layer may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron injection layer may include an alkali metal, an alkalineearth metal, a rare earth metal, an alkali metal compound, an alkalineearth-metal compound, a rare earth metal compound, an alkali metalcomplex, an alkaline earth-metal complex, a rare earth metal complex, orany combinations thereof.

The alkali metal may be selected from Li, Na, K, Rb, and Cs. In one ormore embodiments, the alkali metal may be Li, Na, or Cs. In one or moreembodiments, the alkali metal may be Li or Cs, but embodiments of thepresent disclosure are not limited thereto.

The alkaline earth metal may be selected from Mg, Ca, Sr, and Ba.

The rare earth metal may be selected from Sc, Y, Ce, Tb, Yb, and Gd.

The alkali metal compound, the alkaline earth-metal compound, and therare earth metal compound may each independently be selected from oxidesand halides (for example, fluorides, chlorides, bromides, and/oriodides) of the alkali metal, the alkaline earth-metal, and the rareearth metal, respectively.

The alkali metal compound may be selected from alkali metal oxides (suchas Li₂, Cs₂O, and/or K₂O), and alkali metal halides (such as LiF, NaF,CsF, KF, LiI, NaI, CsI, and/or KI). In one or more embodiments, thealkali metal compound may be selected from LiF, Li₂, NaF, LiI, NaI, CsI,and KI, but embodiments of the present disclosure are not limitedthereto.

The alkaline earth-metal compound may be selected from alkalineearth-metal oxides, such as BaO, SrO, CaO, Ba_(x)Sr_(1-x)O (0<x<1),and/or Ba_(x)Ca_(1-x)O (0<x<1). In one or more embodiments, the alkalineearth-metal compound may be selected from BaO, SrO, and CaO, butembodiments of the present disclosure are not limited thereto.

The rare earth metal compound may be selected from YbF₃, ScF₃, Sc₂O₃,Y₂O₃, Ce₂O₃, GdF₃, and TbF₃. In one or more embodiments, the rare earthmetal compound may be selected from YbF₃, ScF₃, TbF₃, YbI₃, ScI₃, andTbI₃, but embodiments of the present disclosure are not limited thereto.

The alkali metal complex, the alkaline earth-metal complex, and the rareearth metal complex may respectively include an ion of alkali metal,alkaline earth-metal, and rare earth metal as described above, and aligand coordinated with a metal ion of the alkali metal complex, thealkaline earth-metal complex, or the rare earth metal complex may beselected from hydroxy quinoline, hydroxy isoquinoline, hydroxybenzoquinoline, hydroxy acridine, hydroxy phenanthridine, hydroxyphenyloxazole, hydroxyphenyl thiazole, hydroxyphenyl oxadiazole, hydroxyphenylthiadiazole, hydroxyphenyl pyridine, hydroxyphenyl benzimidazole,hydroxyphenyl benzothiazole, bipyridine, phenanthroline, andcyclopentadiene, but embodiments of the present disclosure are notlimited thereto.

The electron injection layer may include (e.g., may consist of) analkali metal, an alkaline earth metal, a rare earth metal, an alkalimetal compound, an alkaline earth-metal compound, a rare earth metalcompound, an alkali metal complex, an alkaline earth-metal complex, arare earth metal complex, or any combinations thereof, as describedabove. In one or more embodiments, the electron injection layer mayfurther include an organic material. When the electron injection layerfurther includes an organic material, the alkali metal, the alkalineearth metal, the rare earth metal, the alkali metal compound, thealkaline earth-metal compound, the rare earth metal compound, the alkalimetal complex, the alkaline earth-metal complex, the rare earth metalcomplex, or any combinations thereof may be homogeneously ornon-homogeneously dispersed in a matrix including the organic material.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, for example, about 3 Å to about 90 Å. When a thicknessof the electron injection layer is within any of these ranges,satisfactory (or suitable) electron injection characteristics may beobtained without substantial increase in driving voltage.

Second Electrode 190

The second electrode 190 may be disposed (located) on the organic layer150 having the structure according to embodiments of the presentdisclosure. The second electrode 190 may be a cathode, which is anelectron injection electrode, and in this regard, a material for formingthe second electrode 190 may be selected from metal, an alloy, anelectrically conductive compound, and combinations thereof, which have arelatively low work function.

The second electrode 190 may include at least one selected from lithium(Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium(Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver(Mg—Ag), ITO, and IZO, but embodiments of the present disclosure are notlimited thereto. The first electrode 190 may be a transmissiveelectrode, a semi-transmissive electrode, or a reflective electrode.

The first electrode 190 may have a single-layered structure, or amulti-layered structure including two or more layers.

Description of FIGS. 2 to 4

FIG. 2 is a schematic view of an organic light-emitting device 20according to an embodiment. The organic light-emitting device 20includes a first capping layer 210, the first electrode 110, the organiclayer 150, and the second electrode 190, which are sequentially stackedin this stated order. FIG. 3 is a schematic view of an organiclight-emitting device 30 according to an embodiment. The organiclight-emitting device 30 includes the first electrode 110, the organiclayer 150, the second electrode 190, and a second capping layer 220,which are sequentially stacked in this stated order. FIG. 4 is aschematic view of an organic light-emitting device 40 according to anembodiment. The organic light-emitting device 40 includes the firstcapping layer 210, the first electrode 110, the organic layer 150, thesecond electrode 190, and the second capping layer 220, which aresequentially stacked in this stated order.

Regarding FIGS. 2 to 4 , the first electrode 110, the organic layer 150,and the second electrode 190 may be understood by referring to thedescriptions thereof presented in connection with FIG. 1 .

In the organic layer 150 of each of the organic light-emitting devices20 and 40, light generated in an emission layer may pass through thefirst electrode 110 and the first capping layer 210 toward the outside,wherein the first electrode 110 may be a semi-transmissive electrode ora transmissive electrode. In the organic layer 150 of each of theorganic light-emitting devices 30 and 40, light generated in an emissionlayer may pass through the second electrode 190 and the second cappinglayer 220 toward the outside, wherein the second electrode 190 may be asemi-transmissive electrode or a transmissive electrode.

The first capping layer 210 and the second capping layer 220 mayincrease external luminescence efficiency according to the principle ofconstructive interference.

The first capping layer 210 and the second capping layer 220 may eachindependently be an organic capping layer including an organic material,an inorganic capping layer including an inorganic material, or acomposite capping layer including an organic material and an inorganicmaterial.

At least one selected from the first capping layer 210 and the secondcapping layer 220 may each independently include at least one materialselected from carbocyclic compounds, heterocyclic compounds, amine-basedcompounds, porphyrine derivatives, phthalocyanine derivatives,naphthalocyanine derivatives, alkali metal complexes, and alkalineearth-based complexes. The carbocyclic compound, the heterocycliccompound, and the amine-based compound may each independently beoptionally substituted with a substituent containing at least oneelement selected from O, N, S, Se, Si, F, C, Br, and I. In one or moreembodiments, at least one selected from the first capping layer 210 andthe second capping layer 220 may each independently include anamine-based compound.

In one or more embodiments, at least one selected from the first cappinglayer 210 and the second capping layer 220 may each independentlyinclude the compound represented by Formula 201 or the compoundrepresented by Formula 202.

In one or more embodiments, at least one selected from the first cappinglayer 210 and the second capping layer 220 may each independentlyinclude a compound selected from Compounds HT28 to HT33 and CompoundsCP1 to CP5, but embodiments of the present disclosure are not limitedthereto:

Hereinbefore, the organic light-emitting device according to one or moreembodiments of the present disclosure has been described in connectionwith FIGS. 1 to 4 , but embodiments of the present disclosure are notlimited thereto.

Layers constituting the hole transport region, the emission layer, andlayers constituting the electron transport region may be formed in acertain region by using one or more suitable methods selected fromvacuum deposition, spin coating, casting, Langmuir-Blodgett (LB)deposition, ink-jet printing, laser-printing, and laser-induced thermalimaging.

When layers constituting the hole transport region, the emission layer,and layers constituting the electron transport region are formed byvacuum deposition, the deposition may be performed at a depositiontemperature of about 100° C. to about 500° C., a vacuum degree of about10⁻⁸ torr to about 10⁻³ torr, and a deposition speed of about 0.01 Å/secto about 100 Å/sec, by taking into account a material to be included ina layer to be formed, and the structure of a layer to be formed.

When layers constituting the hole transport region, the emission layer,and layers constituting the electron transport region are formed by spincoating, the spin coating may be performed at a coating speed of about2,000 rpm to about 5,000 rpm and at a heat treatment temperature ofabout 80° C. to 200° C., by taking into account a material to beincluded in a layer to be formed, and the structure of a layer to beformed.

General Definition of Substituents

The term “C₁-C₆₀ alkyl group” as used herein may refer to a linear orbranched aliphatic saturated hydrocarbon monovalent group having 1 to 60carbon atoms, and non-limiting examples thereof include a methyl group,an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an isoamyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group” as used herein may refer to a divalentgroup having the same structure as the C₁-C₆₀ alkyl group.

The term “C₂-C₆₀ alkenyl group” as used herein may refer to ahydrocarbon group having at least one carbon-carbon double bond at oneor more positions along the hydrocarbon chain of the C₂-C₆₀ alkyl group(e.g., in the middle and/or at the terminus of the C₂-C₆₀ alkyl group),and non-limiting examples thereof include an ethenyl group, a propenylgroup, and a butenyl group. The term “C₂-C₆₀ alkenylene group” as usedherein may refer to a divalent group having the same structure as theC₂-C₆₀ alkenyl group.

The term “C₂-C₆₀ alkynyl group” as used herein may refer to ahydrocarbon group having at least one carbon-carbon triple bond at oneor more positions along the hydrocarbon chain of the C₂-C₆₀ alkyl group(e.g., in the middle and/or at the terminus of the C₂-C₆₀ alkyl group),and non-limiting examples thereof include an ethynyl group and apropynyl group. The term “C₂-C₆₀ alkynylene group” as used herein mayrefer to a divalent group having the same structure as the C₂-C₆₀alkynyl group.

The term “C₁-C₆₀ alkoxy group” as used herein may refer to a monovalentgroup represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group),and non-limiting examples thereof include a methoxy group, an ethoxygroup, and an isopropyloxy group.

The term “C₃-C₁₀ cycloalkyl group” as used herein may refer to amonovalent saturated hydrocarbon monocyclic group having 3 to 10 carbonatoms, and non-limiting examples thereof include a cyclopropyl group, acyclobutyl group, a cyclopentyl group, a cyclohexyl group, and acycloheptyl group. The term “C₃-C₁₀ cycloalkylene group” as used hereinmay refer to a divalent group having the same structure as the C₃-C₁₀cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group” as used herein may refer to amonovalent monocyclic group having at least one heteroatom selected fromN, O, Si, P, and S as a ring-forming atom and 1 to 10 carbon atoms, andnon-limiting examples thereof include a 1,2,3,4-oxatriazolidinyl group,a tetrahydrofuranyl group, and a tetrahydrothiophenyl group. The term“C₁-C₁₀ heterocycloalkylene group” as used herein may refer to adivalent group having the same structure as the C₁-C₁₀ heterocycloalkylgroup.

The term “C₃-C₁₀ cycloalkenyl group” as used herein may refer to amonovalent monocyclic group that has 3 to 10 carbon atoms and at leastone carbon-carbon double bond in the ring thereof and no aromaticity,and non-limiting examples thereof include a cyclopentenyl group, acyclohexenyl group, and a cycloheptenyl group. The term “C₃-C₁₀cycloalkenylene group” as used herein may refer to a divalent grouphaving the same structure as the C₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein may refer to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one carbon-carbon double bond in its ring. Non-limitingexamples of the C₁-C₁₀ heterocycloalkenyl group include a4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, anda 2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup” as used herein may refer to a divalent group having the samestructure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein may refer to a monovalentgroup having a carbocyclic aromatic system having 6 to 60 carbon atoms.Non-limiting examples of the C₆-C₆₀ aryl group include a phenyl group, anaphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenylgroup, and a chrysenyl group. The term “C₆-C₆₀ arylene group” as usedherein may refer to a divalent group having the same structure as theC₆-C₆₀ aryl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylenegroup each independently include two or more rings, the respective ringsmay be fused to each other.

The term “C₁-C₆₀ heteroaryl group” as used herein may refer to amonovalent group having a carbocyclic aromatic system that has at leastone heteroatom selected from N, O, Si, P, and S as a ring-forming atom,in addition to 1 to 60 carbon atoms. Non-limiting examples of the C₁-C₆₀heteroaryl group include a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinylgroup, and an isoquinolinyl group. The term “C₁-C₆₀ heteroarylene group”as used herein may refer to a divalent group having the same structureas the C₁-C₆₀ heteroaryl group. When the C₁-C₆₀ heteroaryl group and theC₁-C₆₀ heteroarylene group each independently include two or more rings,the respective rings may be condensed (fused) with each other.

The term “C₆-C₆₀ aryloxy group” as used herein may refer to a monovalentgroup represented by —OA₁₀₂ (wherein A₁₀₂ is the C₆-C₆₀ aryl group), anda C₆-C₆₀ arylthio group used herein may refer to a monovalent grouprepresented by —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ aryl group).

The term “monovalent non-aromatic condensed polycyclic group” as usedherein may refer to a monovalent group (for example, having 8 to 60carbon atoms) having two or more rings condensed with each other, onlycarbon atoms as ring-forming atoms, and no aromaticity in its entiremolecular structure. A non-limiting example of the monovalentnon-aromatic condensed polycyclic group is a fluorenyl group. The term“divalent non-aromatic condensed polycyclic group” as used herein mayrefer to a divalent group having the same structure as the monovalentnon-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” asused herein may refer to a monovalent group (for example, having 1 to 60carbon atoms) having two or more rings condensed to each other, at leastone heteroatom selected from N, O, Si, P, and S, other than carbonatoms, as a ring-forming atom, and no aromaticity in its entiremolecular structure. A non-limiting example of the monovalentnon-aromatic condensed heteropolycyclic group is a carbazolyl group. Theterm “divalent non-aromatic condensed heteropolycyclic group” as usedherein may refer to a divalent group having the same structure as themonovalent non-aromatic condensed heteropolycyclic group.

The term “C₅-C₆₀ carbocyclic group” as used herein may refer to amonocyclic or polycyclic group having 5 to 60 carbon atoms in whichring-forming atoms are carbon atoms only. The term “C₅-C₆₀ carbocyclicgroup” as used herein may refer to an aromatic carbocyclic group or anon-aromatic carbocyclic group. The C₅-C₆₀ carbocyclic group may be aring (such as benzene), a monovalent group (such as a phenyl group), ora divalent group (such as a phenylene group). In one or moreembodiments, depending on the number of substituents connected to theC₅-C₆₀ carbocyclic group, the C₅-C₆₀ carbocyclic group may be atrivalent group or a quadrivalent group.

The term “C₁-C₆₀ heterocyclic group” as used herein may refer to a grouphaving the same structure as the C₅-C₆₀ carbocyclic group, except thatas a ring-forming atom, at least one heteroatom selected from N, O, Si,P, and S is used, in addition to carbon atoms (the number of carbonatoms may be in a range of 1 to 60).

In the present specification, at least one substituent of thesubstituted C₅-C₆₀ carbocyclic group, the substituted C₁-C₆₀heterocyclic group, the substituted C₃-C₁₀ cycloalkylene group, thesubstituted C₁-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀cycloalkenylene group, the substituted C₁-C₁₀ heterocycloalkenylenegroup, the substituted C₆-C₆₀ arylene group, the substituted C₁-C₆₀heteroarylene group, the substituted divalent non-aromatic condensedpolycyclic group, the substituted divalent non-aromatic condensedheteropolycyclic group, the substituted C₁-C₆₀ alkyl group, thesubstituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group,the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₁-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group may be selected from:

-   -   deuterium, —F, —C, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀        alkynyl group, and a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, and a C₁-C₆₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy        group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),        —S(═O)₂(Q₁), and —P(═O)(Q₁₁)(Q₁₂);    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl        group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀        cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀        cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀        aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a        C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed        polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂),        —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂);        and    -   —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁) and —P(═O)(Q₃₁)(Q₃₂), and    -   Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be        selected from hydrogen, deuterium, —F, —C, —Br, —I, a hydroxyl        group, a cyano group, a nitro group, an amidino group, a        hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a        C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy        group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl        group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl        group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group, a biphenyl group,        and a terphenyl group.

The term “Ph” as used herein may refer to a phenyl group, the term “Me”as used herein may refer to a methyl group, the term “Et” as used hereinmay refer to an ethyl group, the term “ter-Bu” or “Bu^(t)” as usedherein may refer to a tert-butyl group, the term “OMe” as used hereinmay refer to a methoxy group, and “D” may refer to deuterium.

The term “biphenyl group” as used herein may refer to “a phenyl groupsubstituted with a phenyl group”. In other words, the “biphenyl group”is a substituted phenyl group having a C₆-C₆₀ aryl group as asubstituent.

The term “terphenyl group” as used herein may refer to “a phenyl groupsubstituted with a biphenyl group”. In other words, the “terphenylgroup” is a phenyl group having, as a substituent, a C₆-C₆₀ aryl groupsubstituted with a C₆-C₆₀ aryl group.

-   -   and *′ as used herein, unless defined otherwise, each refer to a        binding site to a neighboring atom in a corresponding formula.

Hereinafter, a compound according to embodiments and an organiclight-emitting device according to embodiments will be described in moredetail with reference to Synthesis Examples and Examples. The wording “Bwas used instead of A” used in describing Synthesis Examples may referto an identical molar equivalent of B being used in place of A.

EXAMPLES Synthesis Example Synthesis Example 1: Synthesis of Compound 14

Synthesis of Intermediate 14-1

N-(3,5-dibromophenyl)-N-phenyldibenzo[b,d]furan-1-amine (1 eq),N,9-diphenyl-9H-carbazol-4-amine (2 eq),tris(dibenzylideneacetone)dipalladium(0) (0.1 eq),tri-tert-butylphosphine (0.2 eq), and sodium tert-butoxide (5 eq) weredissolved in toluene and stirred at a temperature of 100° C. for 12hours. After the reaction mixture was cooled, the reaction mixture waswashed three times by using ethyl acetate and water to obtain an organiclayer. The organic layer was dried by using MgSO₄ under reducedpressure. A product obtained therefrom was purified by columnchromatography to obtain Intermediate 14-1 (yield: 65%).

Synthesis of Compound 14

Intermediate 14-1 (1 eq) was dissolved in ortho-dichlorobenzene, and thereaction mixture was cooled to a temperature of 0° C. BBr₃ (2 eq) wasslowly added thereto. The reaction mixture was heated to a temperatureof 180° C. and stirred in a nitrogen environment for 24 hours. Thereaction mixture was cooled, and triethylamine was slowly added theretoto quench the reaction. Then, precipitation and filtering were performedby adding ethyl alcohol thereto to obtain a reaction product. Then, thereaction product was purified by column chromatography to obtainCompound 14 (yield: 20%).

Synthesis Example 2: Synthesis of Compound 20

Synthesis of Intermediate 20-1

Intermediate 20-1 (yield: 71%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 14-1,except that N-(3,5-dibromophenyl)-N-phenyldibenzo[b,d]thiophen-1-aminewas used instead ofN-(3,5-dibromophenyl)-N-phenyldibenzo[b,d]furan-1-amine.

Synthesis of Compound 20

Compound 20 (yield: 29%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate20-1 was used instead of Intermediate 14-1.

Synthesis Example 3: Synthesis of Compound 107

Synthesis of Intermediate 107-1

Intermediate 107-1 (yield: 64%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 14-1,except that N-isopropyl-9-phenyl-9H-carbazol-4-amine (3 eq) was usedinstead of N,9-diphenyl-9H-carbazol-4-amine (2 eq), and tribromobenzene(1 eq) was used instead ofN-(3,5-dibromophenyl)-N-phenyldibenzo[b,d]furan-1-amine (1 eq).

Synthesis of Compound 107

Compound 107 (yield: 14%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate107-1 was used instead of Intermediate 14-1.

Synthesis Example 4: Synthesis of Compound 114

Synthesis of Intermediate 114-1

Intermediate 114-1 (yield: 65%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 107-1,except that N-(2,6-dimethylphenyl)-9-phenyl-9H-carbazol-4-amine (3 eq)was used instead of N-isopropyl-9-phenyl-9H-carbazol-4-amine (3 eq).

Synthesis of Compound 114

Compound 114 (yield: 20%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate114-1 was used instead of Intermediate 14-1.

Synthesis Example 5: Synthesis of Compound 115

Synthesis of Intermediate 115-1

Intermediate 115-1 (yield: 58%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 107-1,except that N-(2,6-dimethylphenyl)dibenzo[b,d]furan-1-amine (3 eq) wasused instead of N-isopropyl-9-phenyl-9H-carbazol-4-amine (3 eq).

Synthesis of Compound 115

Compound 115 (yield: 12%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate115-1 was used instead of Intermediate 14-1.

Synthesis Example 6: Synthesis of Compound 116

Synthesis of Intermediate 116-1

Intermediate 116-1 (yield: 52%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 107-1,except that N-(2,6-dimethylphenyl)dibenzo[b,d]thiophen-1-amine (3 eq)was used instead of N-isopropyl-9-phenyl-9H-carbazol-4-amine (3 eq).

Synthesis of Compound 116

Compound 116 (yield: 24%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate116-1 was used instead of Intermediate 14-1.

Synthesis Example 7: Synthesis of Compound 117

Synthesis of Intermediate 117-1

Intermediate 117-1 (yield: 52%) was obtained in the same (orsubstantially the same) manner as in Synthesis of Intermediate 14-1,except that N-mesityl-9-phenyl-9H-carbazol-4-amine was used instead ofN,9-diphenyl-9H-carbazol-4-amine, andN-(3,5-dibromophenyl)-N-mesityldibenzo[b,d]thiophen-1-amine was usedinstead of N-(3,5-dibromophenyl)-N-phenyldibenzo[b,d]furan-1-amine.

Synthesis of Compound 117

Compound 117 (yield: 22%) was obtained in the same (or substantially thesame) manner as in Synthesis of Compound 14, except that Intermediate117-1 was used instead of Intermediate 14-1.

¹H NMR and (Fast Atom Bombardment Mass Spectrometry) MS/FAB of Compoundssynthesized according to Synthesis Examples 1 to 7 are shown in Table 1.

Synthesis methods of compounds other than Compounds shown in Table 1should be easily recognized by those of ordinary skill in the art byreferring to the synthesis mechanisms and source materials describedabove.

TABLE 1 MS/FAB Compound ¹H NMR (CDCl₃, 400 MHz) found calc. 14 8.60-8.52(2H, m), 8.21-8.16 (2H, m), 7.93-7.76 (7H, 1007.99 1008.00 m), 7.71-7.44(17H, m), 7.43-7.17 (12H, m), 6.83-6.76 (6H, m) 20 8.61-8.57 (2H, m),8.23-8.06 (3H, m), 7.97-7.80 (8H, 1024.06 1024.07 m), 7.66-7.24 (27H,m), 6.98-6.80 (6H, m) 107 8.31-8.24 (2H, m), 8.15-8.07 (3H, m),7.96-7.81 (9H, 981.06 981.07 m), 7.73-7.68 (1H, m), 7.58-7.45 (8H, m),7.42-7.24 (10H, m), 7.08-6.87 (3H, m), 4.90-4.82 (2H, m), 1.33- 1.25(18H, m) 114 8.59-8.41 (2H, m), 7.98-7.88 (5H, m), 7.85-7.76 (3H,1167.27 1167.28 m), 7.71-7.41 (8H, m), 7.38-7.24 (6H, m), 7.19-6.79(19H, m), 5.38-5.32 (1H, m), 3.40-3.35 (1H, m), 2.58- 2.44 (1H, m),2.29-2.26 (18H, m) 115 8.01-7.81 (2H, m), 7.74-7.39 (11H, m), 7.36-7.04(9H, 941.93 941.94 m), 6.94-6.78 (6H, m), 5.49-5.44 (1H, m), 3.43-3.40(1H, m), 2.51-2.20 (20H, m) 116 8.18-8.06 (2H, m), 7.95-7.74 (5H, m),7.61-7.36 (6H, 990.11 990.12 m), 7.26-7.03 (10H, m), 6.92-6.83 (5H, m),5.80-5.75 (1H, m), 3.40-3.33 (1H, m), 2.72-2.69 (1H, m), 2.45- 2.28 (7H,m), 2.26-2.24 (12H, m) 117 8.53-8.50 (2H, m), 8.09-7.99 (3H, m),7.97-7.90 (5H, 1150.30 1150.31 m), 7.86-7.80 (3H, m), 7.64-7.26 (21H,m), 6.86-6.83 (6H, m), 2.27-2.23 (18H, m)

EVALUATION EXAMPLES Evaluation Example 1: Evaluation of Characteristicsof TADF Compound

The HOMO energy level (E_(HOMO)), LUMO energy level (E_(LUMO)), energygap (E_(g)), energy level, S1 energy level, and oscillator strength ofCompounds synthesized according to Synthesis Examples 1 to 7 andcomparative Compounds A to F and Compound DABNA1 were obtained byquantum chemical calculation. The quantum chemical calculation wasperformed by using Gaussian 09, based on DFT (B3LYP/6-31 G*)calculation.

TABLE 2 E_(HOMO) E_(LUMO) E_(g) T1 S1 Oscillator No. (eV) (eV) (eV) (eV)(eV) strength ΔE_(ST)  14 −4.569 −1.085 3.484 2.708 2.898 f = 0.28860.191  20 −4.532 −1.060 3.472 2.717 2.857 f = 0.2347 0.140 107 −4.579−0.953 3.626 2.767 3.065 f = 0.2978 0.298 114 −4.611 −1.278 3.333 2.5942.784 f = 0.2621 0.190 115 −4.908 −1.232 3.676 2.755 2.980 f = 0.29800.225 116 −4.953 −1.725 3.228 2.554 2.667 f = 0.2120 0.113 117 −4.590−1.323 3.267 2.546 2.718 f = 0.2600 0.172 DABNA1 −4.735 −1.095 3.6402.618 3.110 f = 0.2035 0.492 A −4.919 −1.497 3.421 2.592 2.956 f =0.2297 0.364 B −4.783 −1.401 3.382 2.412 2.900 f = 0.2473 0.488 C −4.787−1.249 3.538 2.580 3.035 f = 0.2128 0.456 D −4.752 −1.280 3.472 2.7173.086 f = 0.1219 0.369 E −4.539 −0.858 3.681 2.581 2.909 f = 0.28780.328 F −4.906 −1.242 3.663 2.618 2.934 f = 0.2401 0.316

From the results of Table 1, it is confirmed that the compound accordingto one or more embodiments has small ΔE_(ST) and generally increasedoscillator strength, as compared with related compound DABNA1 andCompounds A to F.

Evaluation Example 2: Evaluation of Device Performance Example 1

As an anode, a Corning 15 Ω/cm² (1,200 Å) ITO glass substrate was cut toa size of 50 mm×50 mm×0.7 mm, sonicated with isopropyl alcohol and purewater each for 5 minutes, and then cleaned by exposure to ultravioletrays and ozone for 30 minutes. Then, the ITO glass substrate wasprovided to a vacuum deposition apparatus. Compound NPD wasvacuum-deposited on the ITO glass substrate to form a hole injectionlayer having a thickness of 300 Å, and a hole transport compound TCTAwas vacuum-deposited on the hole injection layer to form a first holetransport layer having a thickness of 200 Å. A hole transport compoundCzSi was vacuum-deposited on the first hole transport layer to form asecond hole transport layer having a thickness of 100 Å. mCP andCompound 14 were co-deposited on the second hole transport layer at aweight ratio of 99:1 to form an emission layer having a thickness of 200Å. Then, TSPO1 was deposited on the emission layer to form a bufferlayer having a thickness of 200 Å, and an electron transport compoundTPBI was deposited on the buffer layer to form an electron transportlayer having a thickness of 300 Å. An alkali metal halide LiF wasdeposited on the electron transport layer to form an electron injectionlayer having a thickness of 10 Å, and Al (cathode electrode) wasvacuum-deposited to a thickness of 3,000 Å to form a LiF/A electrode,thereby completing the manufacture of an organic light-emitting device.

Examples 2 to 7

Organic light-emitting devices were manufactured in the same (orsubstantially the same) manner as in Example 1, except that Compoundsshown in Table 3 were respectively used in forming an emission layer.

Comparative Examples 1 to 5

Organic light-emitting devices were manufactured in the same (orsubstantially the same) manner as in Example 1, except that CompoundDABNA-1 and Compounds A to D were respectively used in forming anemission layer.

The driving voltage (V), efficiency (cd/A), and maximum quantumefficiency (%) of the organic light-emitting devices manufacturedaccording to Examples 1 to 7 and Comparative Examples 1 to 5 weremeasured a current density of 10 mA/cm², and results thereof are shownin Table 3.

TABLE 3 Maximum Light- Driving quantum Emis- emitting voltage Efficiencyefficiency sion material (V) (Cd/A) (%) color Example 1 Compound 14 4.420.5 20.3 Blue Example 2 Compound 20 4.8 18.9 21.9 Blue Example 3Compound 107 5.3 14.8 17.2 Blue Example 4 Compound 114 4.5 22.8 21.3Blue Example 5 Compound 115 4.6 21.6 20.9 Blue Example 6 Compound 1164.3 24.2 21.5 Blue Example 7 Compound 117 4.4 23.4 21.3 Blue ComparativeDABNA-1 5.7 12.3 14.1 Blue Example 1 Comparative Compound A 5.5 14.412.7 Deep Example 2 blue Comparative Compound B 5.9 13.5 11.9 Blue-Example 3 green Comparative Compound C 5.3 16.4 14.2 Blue- Example 4green Comparative Compound D 5.5 11.1 10.2 Deep Example 5 blue

From the results of Table 3, it is confirmed that the organiclight-emitting devices of Examples 1 to 7, in which the compoundaccording to one or more embodiments is used as the dopant of theemission layer, have a low driving voltage and improved luminescentefficiency and maximum quantum efficiency, as compared with the organiclight-emitting devices of Comparative Examples 1 to 5. In addition, itis confirmed that the organic light-emitting devices of Examples 1 to 7emit blue light having high color purity, as compared with the organiclight-emitting devices of Comparative Examples 3 and 4.

That is, when the compound according to one or more embodiments is usedin an electronic device, for example, an organic light-emitting device,excellent effects may be exhibited in terms of driving voltage andefficiency.

The organic light-emitting device including the condensed cycliccompound may have a low driving voltage, high efficiency, and a longlifespan.

As used herein, the terms “use,” “using,” and “used” may be consideredsynonymous with the terms “utilize,” “utilizing,” and “utilized,”respectively.

In addition, the terms “substantially,” “about,” and similar terms areused as terms of approximation and not as terms of degree, and areintended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art.

Also, any numerical range recited herein is intended to include allsubranges of the same numerical precision subsumed within the recitedrange. For example, a range of “1.0 to 10.0” is intended to include allsubranges between (and including) the recited minimum value of 1.0 andthe recited maximum value of 10.0, that is, having a minimum value equalto or greater than 1.0 and a maximum value equal to or less than 10.0,such as, for example, 2.4 to 7.6. Any maximum numerical limitationrecited herein is intended to include all lower numerical limitationssubsumed therein and any minimum numerical limitation recited in thisspecification is intended to include all higher numerical limitationssubsumed therein. Accordingly, Applicant reserves the right to amendthis specification, including the claims, to expressly recite anysub-range subsumed within the ranges expressly recited herein.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

While one or more embodiments have been described with reference to thefigures, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope of the present disclosure as definedby the following claims and equivalents thereof.

What is claimed is:
 1. An organic light-emitting device comprising: afirst electrode; a second electrode facing the first electrode; anorganic layer between the first electrode and the second electrode, theorganic layer comprising an emission layer; and at least one condensedcyclic compound represented by Formula 1:

wherein, in Formula 1, Y₁ is N or C(R₁), Y₂ is N or C(R₂), Y₃ is N orC(R₃), Y₄ is N or C(R₄), Y₅ is N or C(R₅), Y₆ is N or C(R₆), Y₇ is N orC(R₇), Y₈ is N or C(R₈), Y₉ is N or C(R₉), Y₁₀ is N or C(R₁₀), Y₁₁ is Nor C(R₁₁), Y₁₂ is N or C(R₁₂), Y₁₃ is N or C(R₁₃), Y₁₄ is N or C(R₁₄),and Y₁₅ is N or C(R₁₅), wherein at least one selected from Y₁ to Y₁₅ isnot N, X₁ is selected from O, S, N(R₁₆), C(R₁₆)(R₁₇), and Si(R₁₆)(R₁₇),X₂ is selected from O, S, N(R₁₈), C(R₁₈)(R₁₉), and Si(R₁₈)(R₁₉), and atleast one selected from R₁ to R₁₅ is a group represented by Formula 2:

wherein, in Formulae 1 and 2, L₁ to L₃ are each independently selectedfrom a single bond, a substituted or unsubstituted C₅-C₆₀ carbocyclicgroup, and a substituted or unsubstituted C₁-C₆₀ heterocyclic group, a1to a3 are each independently an integer from 1 to 3, X₃ is selected fromO, S, N(R₂₂), C(R₂₂)(R₂₃), and Si(R₂₂)(R₂₃), A₁ is selected from aC₅-C₃₀ carbocyclic group and a C₂-C₃₀ heterocyclic group, Ar₁ to Ar₃ areeach independently selected from a substituted or unsubstituted C₁-C₆₀alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, R₁ to R₂₃ are eachindependently selected from hydrogen, deuterium, —F —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkylgroup, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁),—S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂), R₁₆ and R₁₇, R₁₈ and R₁₉, and/or R₂₂and R₂₃ are optionally linked to form a saturated ring or an unsaturatedring, and R₉ and R₁₀ are not linked to each other, b20 is an integerfrom 1 to 3, b21 is an integer from 1 to 6, at least one substituent ofthe substituted C₅-C₆₀ carbocyclic group, the substituted C₁-C₆₀heterocyclic group, the substituted C₁-C₆₀ alkyl group, the substitutedC₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, thesubstituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₁-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, anda C₁-C₆₀ alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂),—B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁), —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂); a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group; a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂),—C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂); and —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and Q₁ toQ₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 2. The organic light-emitting device ofclaim 1, wherein the first electrode is an anode, the second electrodeis a cathode the organic layer comprises the condensed cyclic compound,the organic layer further comprises a hole transport region between thefirst electrode and the emission layer, and an electron transport regionbetween the emission layer and the second electrode, the hole transportregion comprises a hole injection layer, a hole transport layer, anemission auxiliary layer, an electron blocking layer, or any combinationthereof, and the electron transport region comprises a hole blockinglayer, an electron transport layer, an electron injection layer, or anycombination thereof.
 3. The organic light-emitting device of claim 1,wherein the emission layer comprises the condensed cyclic compound. 4.The organic light-emitting device of claim 3, wherein the condensedcyclic compound is a thermally activated delayed fluorescence (TADF)emitter satisfying Equation 1:ΔE _(st) =S1−T1≤0.4 eV.  Equation 1 wherein in Equation 1, S1 is asinglet energy level of the condensed cyclic compound, and T1 is atriplet energy level of the condensed cyclic compound.
 5. The organiclight-emitting device of claim 3, wherein the emission layer furthercomprises a host, and the host comprises at least one selected from ananthracene-based compound, a pyrene-based compound, aspiro-bifluorene-based compound, a carbazole-based compound, abenzimidazole-based compound, and a phosphine oxide-based compound. 6.The organic light-emitting device of claim 3, wherein the emission layeris to emit blue light having a wavelength of maximum emission of 420 nmor more and 480 nm or less.
 7. The organic light-emitting device ofclaim 2, wherein the hole transport region comprises a hole transportlayer, and the hole transport layer comprises a first hole transportlayer and a second hole transport layer.
 8. A condensed cyclic compoundrepresented by Formula 1:

wherein, in Formula 1, Y₁ is N or C(R₁), Y₂ is N or C(R₂), Y₃ is N orC(R₃), Y₄ is N or C(R₄), Y₅ is N or C(R₅), Y₆ is N or C(R₆), Y₇ is N orC(R₇), Y₈ is N or C(R₈), Y₉ is N or C(R₉), Y₁₀ is N or C(R₁₀), Y₁₁ is Nor C(R₁₁), Y₁₂ is N or C(R₁₂), Y₁₃ is N or C(R₁₃), Y₁₄ is N or C(R₁₄),and Y₁₅ is N or C(R₁₅), wherein at least one selected from Y₁ to Y₁₅ isnot N, X₁ is selected from O, S, N(R₁₆), C(R₁₆)(R₁₇), and Si(R₁₆)(R₁₇),X₂ is selected from O, S, N(R₁₈), C(R₁₈)(R₁₉), and Si(R₁₈)(R₁₉), and atleast one selected from R₁ to R₁₅ is a group represented by Formula 2:

wherein, in Formulae 1 and 2, L₁ to L₃ are each independently selectedfrom a single bond, a substituted or unsubstituted C₅-C₆₀ carbocyclicgroup, and a substituted or unsubstituted C₁-C₆₀ heterocyclic group, a1to a3 are each independently an integer from 1 to 3, X₃ is selected fromO, S, N(R₂₂), C(R₂₂)(R₂₃), and Si(R₂₂)(R₂₃), A₁ is selected from aC₅-C₃₀ carbocyclic group and a C₂-C₃₀ heterocyclic group, Ar₁ to Ar₃ areeach independently selected from a substituted or unsubstituted C₁-C₆₀alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, R₁ to R₂₃ are eachindependently selected from hydrogen, deuterium, —F —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a carboxylic acid group or a saltthereof, a sulfonic acid group or a salt thereof, a phosphoric acidgroup or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkylgroup, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁),—S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂), R₁₆ and R₁₇, R₁₈ and R₁₉, and/or R₂₂and R₂₃ are optionally linked to form a saturated ring or an unsaturatedring, and R₉ and R₁₀ are not linked to each other, b20 is an integerfrom 1 to 3, b21 is an integer from 1 to 6, at least one substituent ofthe substituted C₅-C₆₀ carbocyclic group, the substituted C₁-C₆₀heterocyclic group, the substituted C₁-C₆₀ alkyl group, the substitutedC₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, thesubstituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₁-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, anda C₁-C₆₀ alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂),—B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁), —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂); a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, and a monovalentnon-aromatic condensed heteropolycyclic group; a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, and a monovalent non-aromaticcondensed heteropolycyclic group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂),—C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂); and —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and Q₁ toQ₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ are each independentlyselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 9. The condensed cyclic compound of claim8, wherein Y₁ is C(R₁), Y₂ is C(R₂), Y₃ is C(R₃), Y₄ is C(R₄), Y₅ isC(R₅), Y₆ is C(R₆), Y₇ is C(R₇), Y₈ is C(R₈), Y₉ is C(R₉), Y₁₀ isC(R₁₀), Y₁₁ is C(R₁₁), Y₁₂ is C(R₁₂), Y₁₃ is C(R₁₃), Y₁₄ is C(R₁₄), andY₁₅ is C(R₁₅).
 10. The condensed cyclic compound of claim 8, wherein Y₁is C(R₁), Y₂ is C(R₂), Y₃ is C(R₃), Y₄ is C(R₄), Y₅ is C(R₅), Y₆ isC(R₆), Y₇ is C(R₇), Y₈ is C(R₈), Y₉ is C(R₉), Y₁₀ is C(R₁₀), Y₁₁ isC(R₁₁), Y₁₂ is C(R₁₂), Y₁₃ is C(R₁₃), Y₁₄ is C(R₁₄), and Y₁₅ is C(R₁₅),R₁ and R₃ to R₁₅ are each independently hydrogen, and R₂ is a grouprepresented by Formula
 2. 11. The condensed cyclic compound of claim 8,wherein the condensed cyclic compound is represented by one selectedfrom Formulae 1-1 to 1-21:

wherein, in Formulae 1-1 to 1-21, at least one selected from R₁ to R₁₅is a group represented by Formula 2, and R₁ to R₁₉ are eachindependently the same as defined in connection with Formula
 1. 12. Thecondensed cyclic compound of claim 8, wherein Ar₁ to Ar₃ are eachindependently selected from: a C₁-C₂₀ alkyl group, a C₂-C₂₀ alkenylgroup, a C₂-C₂₀ alkynyl group, and a C₁-C₂₀ alkoxy group, a C₁-C₂₀ alkylgroup, a C₂-C₂₀ alkenyl group, a C₂-C₂₀ alkynyl group, and a C₁-C₂₀alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cycloctylgroup, an adamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, aphenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group,—N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and—P(═O)(Q₃₁)(Q₃₂); a cyclopentyl group, a cyclohexyl group, a cycloheptylgroup, a cycloctyl group, an adamantanyl group, a norbornanyl group, anorbornenyl group, a cyclopentenyl group, a cyclohexenyl group, acycloheptenyl group, a phenyl group, a pentalenyl group, an indenylgroup, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolylgroup, a furanyl group, a thiophenyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolylgroup, an indazolyl group, a purinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a carbazolyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, a benzothiazolyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinylgroup, and an imidazopyrimidinyl group; and a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cycloctyl group, an adamantanylgroup, a norbornanyl group, a norbornenyl group, a cyclopentenyl group,a cyclohexenyl group, a cycloheptenyl group, a phenyl group, apentalenyl group, an indenyl group, a naphthyl group, a fluorenyl group,a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a furanyl group, a thiophenyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anisoindolyl group, an indolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a carbazolyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzothiazolyl group, an isobenzothiazolyl group, a benzoxazolyl group,an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolylgroup, an imidazopyridinyl group, and an imidazopyrimidinyl group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₂-C₂₀alkenyl group, a C₂-C₂₀ alkynyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cycloctylgroup, an adamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, aphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a pyrrolyl group, a furanyl group, athiophenyl group, an imidazolyl group, a pyrazolyl group, a thiazolylgroup, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, an isoindolyl group, an indolyl group, an indazolyl group, apurinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, abenzothiophenyl group, a benzothiazolyl group, an isobenzothiazolylgroup, a benzoxazolyl group, an isobenzoxazolyl group, a triazolylgroup, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, animidazopyrimidinyl group, —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and Q₃₁ to Q₃₃ are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, acyano group, a C₁-C₂₀ alkyl group, a C₂-C₂₀ alkenyl group, a C₂-C₂₀alkynyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₂₀ aryl group, a C₁-C₂₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 13. The condensed cyclic compound of claim8, wherein Ar₁ to Ar₃ are each independently selected from: a methylgroup, —CD₃, an ethyl group, an n-propyl group, an isopropyl group, ann-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group,an n-pentyl group, an isopentyl group, a sec-pentyl group, a tert-pentylgroup, a neopentyl group, an n-hexyl group, an isohexyl group, and aphenyl group; and a phenyl group substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, amethyl group, —CD₃, an ethyl group, an n-propyl group, an isopropylgroup, an n-butyl group, an isobutyl group, a sec-butyl group, atert-butyl group, an n-pentyl group, an isopentyl group, a sec-pentylgroup, a tert-pentyl group, a neopentyl group, an n-hexyl group, anisohexyl group, and a phenyl group.
 14. The condensed cyclic compound ofclaim 8, wherein Ar₁ to Ar₃ are identical to each other.
 15. Thecondensed cyclic compound of claim 8, wherein L₁ to L₃ are eachindependently a single bond, and a1 to a3 are each independently
 1. 16.The condensed cyclic compound of claim 8, wherein A₁ is selected from abenzene ring, an indene ring, a naphthalene ring, an anthracene ring, afluorene ring, a phenanthrene ring, a triphenylene ring, a pyrene ring,a chrysene ring, a naphthacene ring, a pyrrole ring, an imidazole ring,a pyrazole ring, a pyridine ring, a pyrimidine ring, a pyrazine ring, apyridazine ring, an indole ring, an isoindole ring, an indazole ring, aquinoline ring, an isoquinoline ring, a benzoquinoline ring, anaphthyridine ring, a quinoxaline ring, a quinazoline ring, a cinnolinering, a carbazole ring, a phenanthridine ring, an acridine ring, aphenanthroline ring, a phenazine ring, a benzimidazole ring, a furanring, a benzofuran ring, a thiophene ring, a benzothiophene ring, athiazole ring, an isothiazole ring, a benzothiazole ring, an isoxazolering, an oxazole ring, a triazole ring, an oxadiazole ring, a triazinering, a benzoxazole ring, a dibenzofuran ring, a dibenzothiophene ring,a benzocarbazole ring, and a dibenzocarbazole ring.
 17. The condensedcyclic compound of claim 8, wherein at least one selected from R₁ to R₁₅is a group represented by Formula 2A:

wherein, in Formula 2A, X₃, L₁ to L₃, a1 to a3, Ar₃, R₂₀, R₂₁, b20, andb21 are each independently the same as defined in connection withFormula 2, and * indicates a binding site to a neighboring atom.
 18. Thecondensed cyclic compound of claim 8, wherein at least one selected fromR₁ to R₁₅ is a group represented by Formula 2A-1:

wherein, in Formula 2A-1, X₃, Ar₃, R₂₀, R₂₁, b20, and b21 are eachindependently the same as defined in connection with Formula 2, and *indicates a binding site to a neighboring atom.
 19. The condensed cycliccompound of claim 8, wherein at least one selected from R₁ to R₁₅ isselected from groups represented by any of Formulae 2A-2 to 2A-8:

wherein, in Formulae 2A-2 to 2A-8, Ar₃ is the same as defined inconnection with Formula 2, and * indicates a binding site to aneighboring atom.
 20. The condensed cyclic compound of claim 8, whereinthe condensed cyclic compound is selected from Compounds 1 to 117: